Why not? Please do.
I don't because the default tags (name, artist, album, date fields) contains what other people would consider extra or incorrect information.
example:
My soundtrack date field contains the date of the original premiere date of the movie/show, the release date for the album is contained in a custom date field.
Most of my live tracks contain extra info on when and where the performance took place, normally people just put (live) at the end of the name.
Version info is contained in brackets where as most people uses parenthesis.
Featured artists info is not in the name/artist field but stored in a custom field.
Album name contains a
LOT of additional info.
All this can be fixed easily if I was allowed to send in expression fields, which I would create just to send the info to you guys.