I'll advocate that the "best" approach atm would be allowing you salvaging what you want and leaving duplicates to work.
The long term solution would be a balancing and buffing most of the bulletins to 1.5-2.0 of their current effect and disallowing stacking. But i'm sure there are more pressing issues before doing this (and there's an immense amount of them)
Its not a designed choice when you cant fix something and decide to call it "feature". Its a bug which was ignored so much people started to take it as something normal.
It's not a deployable as MG42/34, 50cal, Vickers or even mortars. As with the 120mm, it's meant to be pushed around (simil to at guns). Again, we may not like it, but it's how it was designed.