The graphics will always improve. There is progress, processors, video cards, and much more, everything is growing. So, whether you like it or not, the graphics will be improved with each iteration.

That's exactly right. The progress of information technology is largely driven by graphics, that is, games. Because, if you think about it, much less powerful machines are sufficient to perform most tasks (calculations, etc.) than what we have... but if you want to play games, then you have to spend money on hardware.

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I mean that the hero has become a separate stack in battle mode. And also, his personal stats no longer affect the stats of other creatures, only tactics. It turned out to be like an RPG.

But why immediately an RPG? Take any turn-based strategy - is the main hero just a container for troops everywhere? And even more so in an RTS? Let's take Rome: Total War, for example -
there, the generals themselves participate in the battle. And an RPG is represented as one single hero walking around, hacking and slashing, gaining experience, and leveling up.
There are no armies controlled by this hero, let alone cities. Examples: Gothic 3, Titan Quest, Diablo, etc. It's something like that in general.