Mailing lists and RSS feeds don't incentivize me to compulsively check them so that the important updates I care about aren't buried under a 47-post rant about why I should be angry about something in the news or hidden by an algorithm because it thinks I'm more likely to engage with a bunch of memes.
Maybe it works if you only follow low-traffic announcement accounts, but when I was actively using Twitter I found that I regularly missed posts like that because they either didn't get engagement (algo timeline) or were posted when I wasn't paying attention (chrono timeline). I understand that a lot of projects have chosen to rely on social media for that kind of news for various reasons, but it's not a good situation.