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if you allow the upgrade, after building the upgrade in the castle, then there is no imbalance whatsoever. Provided that only those units for which this upgrade is available in the castle will be upgraded.
That's exactly what I meant. Let me elaborate a bit more on what you said. For example, you can upgrade angels bought from the castle, but you cannot upgrade angels from the conflux, nor can you upgrade any units not purchased in the castle, except if the angels from the conflux and the angels from the castle have never been in the same stack when meeting — then you can't tell them apart. Otherwise, you could buy 2 angels from the castle, go to another front, and then upgrade, say, 2 out of 4 conflux angels.
I absolutely see no imbalance. Let me give an example. In any game, a player who finds control — let's take Town Portal for instance — can fly freely from the castle and collect growth, while the one without control struggles and loses tempo when gathering troops.
No imbalance, just another nuance that will need to be taken into account. By the way, it would be cool if scout heroes would fight for this object :) stealing it from each other. It would just add a little extra story to the game. Of course, the building is important, but it's clearly not imbalanced. First, because you still have to break the guard. Second, you can upgrade everything in your own castle. And if you're deep in the map, your opponent might be there in principle. If the fort is nearby, consider it a bonus to logistics :) saving moves in various situations.
Added after 6 minutes
Moreover, this rule could be introduced for season 1 as a test. After all, at first, people were not too keen on the new restart system either, but now I think it has fully justified itself and, in my opinion, is even better than the previous one.
Also, there's an interesting point when playing against computers. Before breaking into the fort, you have to think about whether it's worth it. Otherwise, you break the guard, upgrade the allowed units, and then the computer's hero shows up and upgrades all of its own, and GG may happen :)
МУДРЫЙ - не обязательно старый, ОПЫТНЫЙ - не обязательно мудрый... обладатель и того и другого всегда должен помнить слова НАПОЛЕОНА БОНАПАРТА: Война состоит из непредусмотренных событий; В каждом большом деле всегда приходится какую-то часть оставить на долю :smile33: СЛУЧАЯ...


