So Story Time.
When the paths of towers became a thing a long time ago, there was a glitch that allowed you to upgrade towers onto a different path, and since it was patched I shall share how, so you needed to place down the same tower with the selected path, then you go over to the tower you want to upgrade and you Shift Right Click, and it will instantly upgrade the tower to the path you have. I tended not to do this with towers of other unknown players, but with my group of friends and I, we were completely alright with each other selecting paths, much more convenient for everyone involved in our friend group (Please note these are IRL Friends, not in game friends)
Instead of giving an outright No to all of this, I would like to suggest making it possible to do with people in a party, like if I was in a party with a friend, and we know what our towers should be, I should be able to upgrade my friends tower and they can do the same to me. My thoughts on that one.