Did you bother to read the discussions that brought us to this voting, mainly in this forum, where it is explained why windpumps should be retagged?
Rendering suggestion is part of the proposal process. I advise you to read:
https://wiki.openstreetmap.org/wiki/Proposal_process
Anyway, why should that be a problem?
About historic tag, why should it be mentioned in this proposal? The historic scheme is well defined and this proposal doesn’t change or affects any of it. you can add whatever you want to the historic, and besides, there are many mappers in the OSM community against the use of the historic scheme to denote “old things”. Historic should be something verifiable, where something important happened, not to use arbitrarily to tag old or antique things.