Those were most effective against badly underequipped in AT weapons forces in Syria, not a common scenario against proper armies.
Eh, the problem is if the VBIED gets close enough, blowing it up will still give the troops blast injuries, even in trenches.In guerilla warfare it is great.
In a LSCO fight? Ha... that's a joke
I know it's not a 'major' threat compared to the likes of Shahed's or Lancet's, however you can pack a hell of a lot more boom into a BMP or the like than on a flying drone, and it means Russia has some use for even their most clapped out armor, so long as they can get it moving.