I'm actually pretty sure that this does happen if you sack in MTW 2. I've played enough Vanilla when it first came out and some Broken Crescent and most recently TATW to remember this happening distinctly on numerous occasions. I'm not sure if it happens randomly but whenever you sack an advanced city with large barracks, stables, archery ranges, etc. they seem to devolve into a lower tier building. I can't say for sure if this also happens with other "infrastructure buildings" like markets and such but I'm 99% sure it happens with recruitment buildings.If you sack in MTW2 isn't there a random chance of "devolving" a building? Not destroying outright, but instead of a "archery range" it becomes "practice range." So higher level buildings are essentially destroyed but some type of lower level building remains.
Bookmarks