The point is not reducing input per se, but reducing entitled input that doesn't give back anything to the community.
Usually the ones with loudest mouths have the shortest attention span and don’t bother with those things. I have seen this in many communities.
That's true, and it's a good goal.
But, my point is that if we try to reduce entitled input by simply asking people not to behave entitled, then the result may be that we increase entitled input (as a proportion of all input), because many 'entitled' users will ignore the request, because they feel entitled.
In the common scenario where developers are already overwhelmed with suggestions and demands, then they will have even less time to separate out the good suggestions from the bad.