You said you’re looking for a new mouse and that Linux support is a concern in the same message. That is going to lead most people to assume you’re at least open to suggestions. For sure sometimes people in nerdy forums will try to ‘correct’ you rather than help you, but come on.
And the only thing I’d worry about is customization software. Mechanical keyboards are generally well supported on Linux in that regard, but #Gamer #RGB, consumer peripherals will often only target Windows users on the software end of things.
Every fucking suggestion you received can be bought for ~30-50$ right now. If that’s “crazy expensive” to you, maybe you should consider just getting a regular mouse. I’m pretty happy with my 10$ wireless mouse from Amazon. Neither regular or gaming mice will have issues with Linux, as you’d know if you just spent five minutes with any search engine.
So long as you’re not playing competitively, for which you’ll generally want a computer that’s actually “crazy expensive”, you don’t need a gaming mouse. It’s a luxury item.