1- Autocast would be terrible! It wont take long to players to figure out how to exploit the tanks AI, forcing them to siege/unsiege - burrow/unborrow and using that delay to wipe them out
2 - I mean, just get smart servos and problem solved, it takes like half a second to put them all in whatever mode you want them
3 - As for the overkill thing, why? isnt it the case with ALL units? why should a single unit have this buff? specially when its not easy to beat mass tanks with some cheap micro, you want to buff them even more? Were not even talking about quality of life change here, youre proposing a straight up buff to siege tanks