Inferno transition between cities.

The question is about strengthening Inferno, and how does the portal relate to that? It would be more logical to reconsider the unit setup and their costs. But if you want to know my opinion, it's this: the only downside of Inferno is its weak Gogs and expensive Magogs. If they spawned as frequently as in a Castle and were just as easy to upgrade, it would be a different story. And secondly, even more importantly, is the inconvenience of the spawning area itself, its frequent blockage, and its scarcity compared to grass.