Millie O. answered 03/25/19
Spanish Professor -with Masters & 20+ years of Teaching Experience
It makes sense what you said. I agree with you and many millions of latinos will agree with you too, but unfortunately, we have to follow what La Real Academia decides.
They say: Let's go means vamos or vámonos and the negative command is: No vayamos
Most Natives do not know that. I didn't know until I started teaching Spanish. It's one of those things that we have to accept it. Maybe someday, La Real Academia will change it. They have changed so many other things like accents in (fui, dio, vi) they deleted the CH from the alphabet. So, maybe "vayamos" will be accepted. someday...
For now:
Positive: Vamos, Vámonos
Negative: No vayamos