1) 10towns/player is absurd and would never realistically happen, due to the inactivity that would come from it
2) Decreasing your mob farm, isn't a valid reason for something like this, having an entire town dedicated to a mob farm, will kill the servers tick rate, and at that rate, I'd obby the entire structure, causing a refund request to be made
3) Point number 2, is literally solveable by changing myTown permissions..
4) Point number 1, means, nothing, you can hide it in a place without being seeable.
5) 1.12 doesn't use mytowns, that's why it's different on bukkit servers, those servers use Grief Protection, which is completely different from TownClaims, that's why it's like this, towns are a lot bigger than claims themselves, since you can create multiple claims around the map, but are limited by the claim blocks, towns are larger claims, and only allow a certain area to be claimed