Most recently AI - What's the point in encrypting everything end-to-end and then have the end-point stream all messages back to cloud servers running Meta's AI for summarising, "smart"-search and othe similar useless crap?
So yeah that E2EE is very "on paper theoretically", and in practice is mostly a marketing ploy to gain some user confidence avoid them switching, in the years after the scandals around Snowden blowing the whistle.