Equating the teller to the demo is moronic. You can use one sweeper squad to protect your one light tank from mines, you can't sweep every point for all 6 of your infantry squads at the same time.
OHKing lights is lame, but lights are so strong in the meta right now that removing the teller lethality will mess up the faction balance. You already see the puma in 4/5 ostheer matches, it will make ostheer rely on it even more. Need a full overhaul of light vehicle balance if you want to make the teller not OHK them.
I don’t see how the answer to something strong in the meta is literally just OHK. I don’t think it’d be gamebreaking so much as less frustrating and cheesy to make tellers not OHK 60-70 fuel light vehicles. IMO it’d be fair if it left the vehicle with engine damage and enough health to die to a faust.
Despite the fact that it’s much easier to sweep for tellers, losing a light in the midgame to tellers is much worse than losing one of your six infantry squads to a demo. And demos have been nerfed so hard that you’d have to be senile to walk over one with infantry (they literally get countered by a moving and due to small arms) because people said it was cheesy and stupid to lose a squad to one click. You don’t even have to click on a teller to detonate it.