Personally, I’ve found that LLMs are best as discussion partners, to put it in the broadest terms possible. They do well for things you would use a human discussion partner for IRL.

• “I’ve written this thing. Criticize it as if you were the recipient/judge of that thing. How could it be improved?” (Then address its criticisms in your thing… it’s surprisingly good at revealing ways to make your “thing” better, in my experience)
• “I have this personal problem.” (Tell it to keep responses short. Have a natural conversation with it. This is best done spoken out loud if you are using ChatGPT; prevents you from overthinking responses, and forces you to keep the conversation moving. Takes fifteen minutes or more but you will end up with some good advice related to your situation nearly every time. I’ve used this to work out several things internally much better than just thinking on my own. A therapist would be better, but this is surprisingly good.)
• I’ve also had it be useful for various reasons to tell it to play a character as I describe, and then speak to the character in a pretend scenario to work out something related. Use your imagination for how this might be helpful to you. In this case, tell it to not ask you so many questions, and to only ask questions when the character would truly want to ask a question. Helps keep it more normal; otherwise (in the case of ChatGPT which I’m most familiar with) it will always end every response with a question. Often that’s useful, like in the previous example, but in this case it is not.
• etc.

For anything but criticism of something written, I find that the “spoken conversation” features are most useful. I use it a lot in the car during my commute.

For what it’s worth, in case this makes it sound like I’m a writer and my examples are only writing-related, I’m actually not a writer. I’m a software engineer. The first example can apply to writing an application or a proposal or whatever. Second is basically just therapy. Third is more abstract, and often about indirect self-improvement. There are plenty more things that are good for discussion partners, though. I’m sure anyone reading can come up with a few themselves.

May I ask how you’ve used LLMs so far? Because I hear that type of complaint from a lot of people who have tried to use them mainly to get answers to things, or maybe more broadly to replace their search engine, which is not what they’re best suited for, in my opinion.

4K HDR

Normally I use kdenlive to edit video, which supports 4K AFAIK, but although that doesn’t support HDR it looks like DaVinci Resolve supports both.

Taxes

That’s surprising. Turbotax and Quickbooks have online options, and there are a few native apps like GnuCash, but I haven’t used them—TurboTax works for me.

GarageBand

Yeah that’s too bad. I hear good things about Ardour, though. Also, bandlab if you’re okay with a webapp.

Netflix

I only stream on an actual TV, not my computer, so I haven’t done this in a while, but I thought you could do this in Firefox with DRM enabled? If not, seems like there are addons which enable it. Might be outdated knowledge.

vector illustration

Fun is hard to come by

git client

Git clients all suck for me, CLI is the way to go. However, my co-workers that use git clients all use GitKraken (on macOS) and that is available on Linux, too.

screen recording was also painful

Won’t argue with you there. Don’t know why it doesn’t have first-class support in many distros. I hear OBS Studio works well for this if you want to do anything fancy with the recording, otherwise there are plenty of apps for this (Kazam might be a simpler choice).

barely meets my use cases

I think really (considering the above) your main issue is that you just have some strong software preferences. There are certainly ways to meet most if not all of the use cases you listed. It requires a big change in workflow, though.

For what it’s worth, I find that most of the issues with software alternatives in Linux is that everyone often recommends free/GPL replacements, which are invariably worse than the commercial/non-free software the user is used to. But there is paid software in Linux land, too, remember. In my case, I have often found that if I can pay for the software it will be better, and if there’s a webapp version of something non-free it will often be better than the native FOSS alternative. There are many notable exceptions to that rule, but money does solve the occasional headache.

I considered writing at least a post somewhere after reading your comment/adding my reply, but to be honest I don’t even know where it would be best received

I have used it several times for long-form writing as a critic, rather than as a “co-writer.” I write something myself, tell it to pretend to be the person who would be reading this thing (“Act as the beepbooper reviewing this beepboop…”), and ask for critical feedback. It usually has some actually great advice, and then I incorporate that advice into my thing. It ends up taking just as long as writing the thing normally, but materially far better than what I would have written without it.

I’ve also used it to generate an outline to use as a skeleton while writing. Its own writing is often really flat and written in a super passive voice, so it kinda sucks at doing the writing for you if you want it to be good. But it works in these ways as a useful collaborator and I think a lot of people miss that side of it.