Are macOS Sequoia's reported bugs and compatibility issues resolved?

Nothing you list there is a bug. It's a vague list of glitches most of which can be reported about just any computer system in the world. Graphic glitches? That caused by the OS? Or failing hardware? Memory Leaks? That the OS or an app at fault? Again, is there a computer system in the world that is immune to those. Doesn't play nice with Web browsers? What am I typing in now? None of those are systemic issues affecting large numbers of users. They're just odd things reported by some users, I would not worry unduly about them. Make a back up. Make two. Upgrade. If you have serious issue then roll back with one of the backups. If not - and you probably won't, like 99%+ of Users - get on with your life.

If you're waiting for that vague list to be addressed you'll never upgrade or update anything.

We have about 3,000 Macs in use where I work. Upgrades to Sequoia are now mandatory (for security reasons, to comply with our government contract requirements). If those bugs were common, our lab's work would grind to a halt. We have a Slack area where people reports bugs or issues. I do not see any issues reported yet with Sequoia there, at least not yet, but Sequoia has been in use for a while now and is already on 15.3. We have a mandatory VPN for the corporate network when off-lab, and many of the Macs have touch bars (newer ones do not). No issues so far with those either.

If you search on the internet long enough, you will likely find posts somewhere about problems with almost any product.

Those are not typical bugs. Sequoia has no more bugs than any other os might have by a very few users. I never had any of these you list

FWIW, I have used every version of Sequoia since the first beta release in July last year on three Macs without issue.