I don't buy that logic - we now have a medium with more capabilities than email, and we don't have to keep restrictions that just could not be avoided in the past. Btw, I'm pretty sure someone from Core explicitly wrote we should keep writing "me too" comments instead of liking other posts during review.
Also, there is no agreement on what a "like" actually means:
It's something positive, but when you ask for details, everyone may have a personal interpretation (and even a single person may have completely different reasons for liking different posts).
True - but a much bigger variant of the same problem exists with posts, and we probably don't want to anonymize those ;-)