The capacity of human beings to socially interact with others is
limited. Each of us can only “know” so many people. If all of OSM were
on the same platform, in the same forum, even with the best translation
features, it would be a forum without a heart and soul.
Yes, it is possible that groups in different countries or language
regions come to different conclusions about how to use a certain tag or
when to use a multipolygon and when not - but is this really a problem?
Is it absolutely necessary that OSM is 100% the same in every part of
the world? I do not think so.