Personally what drove me away was all the thousands of little annoying things that you just dont have to deal with on other apps like Telegram or Discord or Slack. The final straw for me was the 2nd time losing all chat history because I got logged out on my browser and when logging back in and providing the super secure authentication key and resynchronizing, messages older than 7 days still didn't decrypt on all chats so I just lost all of that. Plus Element client being mega laggy and stuff (though I had a smoother experience with the third party Cinny client).