What evidence do you expect? It's not like Twitter is going to show us a post morterm from their outage. Anyone who knows and uses twitter quite a bit can see that things have been wonky on the sites. Big users have mentioned tons of issues (their mentions being empty, twitter threads going broken, some tweets never reaching their audience not even a bit), etc, etc. It's all anecdotal of course, we can't build a case of evidence, this is a private company and all the shit internally is private. But things are getting worse, not better. Even those big initiatives announced are not actually happening, that paid and free API plan that was supposed to be released in 7 days? It's been a month and nothing. Things are not "normal" and clearly the lack of engineering talent is slowing a lot of things down (both new development and infrastructure resilience).