Complaining is always useful. It conveys information. It's even better if you convey a suggestion on how specifically to improve things. But often the complain

Complaining is always useful. It conveys information. It's even better if you convey a suggestion on how specifically to improve things. But often the complaint itself contains that, implied. For example, a what-you-would-call whiny complaint of "waaaaa... don't touch my arm with that torch, it burns!" contains the rather useful suggestion (implied) to stop touching my arm with that torch. To be more relevant, if Apple suddenly says you can't use any language but XYZ, and we go "waaaa...." what we are saying is "let us use XYZ". I hope that is obvious and implicit in all such cases. :)