60 munitions is enough for something that can be countered.
No other ~60 muni abilities (save satchel which you can predict and has a timer) can kill or damage so much stuff. I think Demos should only be built on structures or green cover - having random 'super mines' be anywhere (like main roads/pathways) is a bit rubbish especially considering that other mines were nerfed to kill max 2 models. Tellers should also perhaps leave light vehicles like stuart, AEC, halftrack (but not M3) with a sliver of health.
Its boring having to have a sweeper everywhere or pay such a heavy price for one small mistake although making them not explode when sweepers were near would be an improvement as its easy to react too slow when spotted