I don't like whatsapp either but my claim still holds. e2ee by default for all chats is arguably more privacy respecting than opt-in e2ee for 1-1 chats only. and what metadata exactly does telegram encrypt but whatsapp does not?
only if you are terrorist or do some CP stuff. Besides there are ton of reasons why I should use telegram.
Its a lot more featureful, its easy for people to move their and its secure enough for me because I am not a terrorist and I dont sell drugs, thanks.