Well, its backend uses Elixir and is performant as fuck so not trash in all possible ways.
And for me Slack shits the bed fairly often and their recent UI enshitification made absolutely no comprehendable sense to me.
Also, your generalization of people who do or don’t like a specific app is wild to me.
Here’s a video out there where he’s talking to Twitter devs telling them they need a total rewrite because their stack is too complicated.
Someone gives him the slightest amount of pushback by asking what exactly he means by a rewrite and he cannot give a coherent answer. Someone else asks him to clarify what it is about their stack that is ‘crazy’. Elon gets very flustered and can only respond by calling the guy a jackass.
He knows absolutely nothing about programming.