Your knowledge and experience does not reflect current reality. Multiple logins haven't been required since the launch of the Quest 2. I didn't have a Quest 1, so I can't comment there.
> You still have to deal with a complicated web of accounts and apps
This is false. Only one account is needed. Sometimes individual apps will require a login, but that's exceedingly rare, or allows you to login with other devices, to the app, outside of the Quest ecosystem. This is not a fault of Meta, it's just the reality of third party credentials. I don't recall the last app I had to
If you buy a headset now, you would make a Meta account that would be used for everything. That's it.
If you had a Facebook account and are ok with continuing with the Facebook account, you're done.
If you had a Facebook account and you want to convert it to a Meta account, you can choose to do this, then you're done.
All three situations above use a single account for all apps, besides those that are meant to be accessible cross platform.