To be fair, this started way before Elon. Yes you could link to individual posts but as soon as you read through the direct reply a soft paywall comes up. Your experience as signed out user was - and still is - awful.
Yes, absolutely. I’m not equating the two. But I do think that requiring sign-in for “town square” public discussions is.. questionable. Imo, Twitter (and others, they’re not at all alone) want to enjoy all the benefits of being an open platform, but doesn’t want to deal with the implications.