Not your parent commenter but I love Firefox more after discovering that you can't even customize the toolbar buttons in Brave. That's such a basic functionality that I'd taken for granted, until I tried to move out of Firefox for a brief time.
Lack of sufficient customization and lack of extensions I want. The customization is a big deal because I dislike the Chromium UI and want to be able to fix the worst of it. My dislike of the UI is also a source of grumbling from me about modern Firefox, which has picked up a lot of Chromium and which is also less customizable than it used to be, but I can still fix a lot.
I also want to be able to use the same browser at work as at home, and my workplace banned the use of Brave when it started including a VPN.
The fact that it's Chrome is the problem with Brave. What you call "bugs and missing features" I call necessary diversity to avoid Google dominating the standardization process more than they already do.
With the massive tide of browsers converting to Chromium under the hood, I wonder how long Apple can hold out. Fingers crossed they keep allocating budget for it.
Apple can hold out indefinitely. If a website doesn't work on Apple devices, that's not Apple's fault, according to legions of Apple users. And they're kinda right: there really are a lot of them, and they do tend to spend more money than other users, so websites that somehow manage to stupidly not work on Safari (presumably by using Chrome-only functionality and never testing) are potentially losing a lot of users and business.
I'm not normally a fan of Apple at all, and I have no interest in using Safari myself, but here I am glad that they've so far refused to jump on the Chrome bandwagon: it's good for keeping the web standards-based so we don't have a repeat of the IE6 days.