It's also not supported for majority of desktop clients, so if you want to continue the "secret chat" you had on mobile on laptop when you get to work/school/whatnot, guess what, you're shit out of luck and need to whip out your phone every time you want to reply. It's so bad you'll just give up and use non-E2EE 1:1 chats because at least they're cross-platform. So one could argue Telegram has no _functional_ E2EE at all.