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The patch doesn't change the total amount of value on the map and doesn't redistribute it in any way. And it doesn't change the defense of the replaced objects. That is, it cannot turn an obelisk + a couple of piles into a Hive or a Utopia. More likely, it will turn it into a Naga Bank + something or an Imp Town + something.
You yourself wrote that the gameplay doesn't change...
If all the obelisks are replaced with Imp Towns, then the Necropolis becomes the primary option, but if someone doesn't give up the Necropolis, how do you fight against such an imbalance?
I don't use HW rules either.