I don't think it is about having committee, but rather having a spec. And I mean spec, not necessarily ISO standard. There should be a description of how specific features work, what is expected behavior, what is unexpected and should be treated as bug, and what is rationale behind specific decision.
Coincidentally people here hate specs as well, and that explains some things.
I know there is some work on Rust spec, but it doesn't seem to progress much.
C++ is not cohesive at all
Examples of cohesive languages designed by committees would be Ada and Haskell.
Geez I'd hate to be in rust dev shoes if I can't remove something later when I have a better better min/max. I guess this could be done off main, stable.
Rust's development process is also design by committee, interestingly enough.
Sure, but it's still quite informal and they just add things as they go instead of writing a complete standard and figuring out how everything interacts before anything is added to the language. Design-by-committee was probably not the best term to use.