Snotling,
I use it as a map balance feature now. For example: I have a city surrounded by ice, with difficult guardians on most spots, but with a simple heavy infantry on one of them. If you don't spawn a yeti and/or something quite powerful for your starting units, you'd be in trouble if I could not use this feature. I have personally found it to be very useful as a feature. There is definitely potential for abuse, but we haven't seen any tendency for the community to behave badly in that regard. It's not going to ruin anything if you fix it. I have had a lot of fun with using it to balance my maps
If you think that it is most important for players to see the strongest unit in the city then I will of course find other ways to balance maps. There is a lot of good to be said for being able to scout cities and predict their production.