Existing features are also suffering and going unfixed. If you browse any tweet with more than a few dozen replies, loading replies takes a notable amount of time, and X very conspicuously does not load all of them. Sometimes changing reply sorting algorithms loads entirely different batches of tweets.

Besides that most basic functionality, many times notifications are not sent when the notification settings would suggest they should be. And of course, moderation has fallen by the wayside, although that's more of a policy shift than a technical failure.

Incidentally, those defects would be good for censorship with deniability.

(Occam says deficit of institutional capability is the most likely cause. But that could also turn into a feature.)