How is defending flanks with mines a bad thing? You don't need to be under a minesweeper umbrella at all times, you just need to be careful and consider "Hey maybe he has mines protecting his flanks!"
This.
If I put like 5 mines to secure my flank (to prevent being flanked from behind) while pushing forward then I excpet that those mines will inflict loses to enemy who will take a bait and run with his infantry to flank me.
I put time and effort to plant mines and same effoert should be put to sweep them.
Idea of not killing but brining models down to 10% HP is just completly out of the moon.
Sure, wiping full health squad is really bad idea, it has huge impact and there should be some line of code which says that full health squads cannot be wiped, but wiping damaged or not full squad should be something normal.