C'mon man you know team weapons are pretty much redundant in anything larger than a 2v2 past the 20 min mark once indirect fire spam starts, even then using a 60 range crew weapon that can be de-manned and turned against you to deal with 60 range tds that can fire on the move is not going to work unless there's a significant skill gap between you and your opponent.
You're free to believe that team weapons are redundant, but you're wrong. Combined arms (especially as ost) is really really important. Sorry you can't just build only infantry and tanks and win the game easily without ever being countered.
I think the best nerf for TDs would be a firerate nerf. That would make them inherently worse against a giant spam of mediums while also making them still remain consistent against heavies.