Earlier quoted context omitted.
Just out of curiosity, what kind of discussion do you have that require e2e? Myself I use TG extensively with friends, family, girlfriend and I think I've used secret chats once when the gf wanted to send a naughty photo. It's not that I don't have anything to hide, it's just I choose what to say according to the environment and I feel the features of telegram far outweigh the con of not having e2e at all times.
Oh no. No. “You have nothing to share.” E2e by default or GTFO. This isn’t about your secrets. It’s about making your regular discourse indistinguishable from secrets. There is no con to e2e, and many cons for snake oil/plaintext.
No multi device support.
No transcoding for video.
No shared history for group chats.
Scaling get progressively harder with increasing participants.