There are a lot of people asking for the per tag feature for the Mason open source extension. It is currently not planned without funding. However, for those who really need this feature, there is a detour to realize part of it -- add more blog sections.
I suppose that those who need Mason to work per tag wish to build a website where some can request some info, and others can post the info as a multiple choice/form/list. Currently the blog extension and the Mason are separated, thus the former user group could discuss in the blogs. The problem is that the blog section has a head image and other things that does not look like discussions. However, I believe by CSS styling you can hide some information.
