It’s not about preventing some exploit, it’s the fact that people would just stack games so that a low rated guy can walk into the enemy base and ctrl+k and then his stuff goes to the better player.
This then results in share until death becoming default which in turn encourages people to play comfy teamgame maps where dying is either unlikely (gap) or easily recoverable (canis) rather than more open ones.
Sheikah has recently created a sim mod for a share condition that blows up your units but not your structures.