Since I am not a member of the development team I can't address all of the points you mention, so this is only what I think regarding a couple of them:
I think the system limits the number of emails generated by any user to 10 per day whether they are comments on a profile bulletin board or private messages. This limit does not apply to Leaders nor Team members - (I'm hoping the reason for this relaxed application will be obvious).
As the pop-up language explains, some of these safeguards came about after spamming occured. It not only can happen, it has happened and caused a great deal of damage for WikiTree and those users affected. Safeguarding against spamming at some level seems a responsible way to operate a Wiki site - to me, at least. ; )
As for input of the "Profile Manager Community", I would like to mention that WikiTree just passed 200,000 users - pretty tough to poll that large a population of such an eclectic assemblage of humans.
Thanks again for your commitment to WikiTree.