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the variety will be lost – it will no longer be possible to combine units of different classes; for example, there might be some synergy between the upgraded unit "A" and the upgraded unit "B" – this synergy will no longer be possible to utilize.
I am definitely against this idea.
Unless it is done like this: if a unit is under the command of a hero of the corresponding class, it receives some kind of buff.
... И древний лес, роскошен и печален, Блистает там воздушностью прогалин. Но между кедров, полных тишиной, Расщелина по склону ниспадала. О, никогда под бледною луной Так пышен не был тот уют лесной...