Discussion about Heroes 4.

The problem is that Ubisoft took the wrong path. If the original developers had continued their work, I'm sure it would have been more like the fourth installment...

I think it would have been exactly like that. If Heroes 1, 2, and 3 were simply updated without changing the core elements, then the fourth installment was completely reworked, and at the same time, everything was comprehensive, complete, and harmonious. There were no obvious flaws where they forgot about something essential – only minor shortcomings and unfinished debugging. All versions have these problems.
But the new company has its own quirks, and they went their own way.