Include group/subgroup topics in ?tag= pages for the topic tags of the same name as the groups
E.g. Show ~humanities.history topics in ?tag=history page,
Show ~engineering topics in ?tag=engineering page,
Etc.
Otherwise adding redundant topic tags to every single post in those groups is going to become necessary so the ?tag= pages still have value for finding/browsing related topics.
Edited by cfabbro