Totally agree with you! I really like Allo, I find it super easy to use and fun! Best of all its cross platform so you can actually chat with both iPhone and Android people, which you can’t do with iMessage.
It has end to end if you want/need it, but why do you actually need that? If you are doing stuff that could get you into trouble there are places to do that and chances are you are already using that.
For me, Allo has the potential to be a fantastic app and I seriously hope that people jump on board. Same goes for Duo.