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It seems like everything has already been said, but I'll reiterate the key ideas:
In "Heroes," the most important things to improve were:
- the computer AI (for single-player);
- the random map generator;
- the online game without "hacks" and "workarounds."
The game rules also needed adjustments to balance the gameplay and eliminate the element of luck: the winner should be determined solely by their skill level.
What has already been done and what is available today?
The HD mod has eliminated and continues to eliminate the game's original bugs, including: the inadequacy of "quick" battles, certain problems in the online game, and it combats cheating...
WT offers gameplay with modified rules (in some cases, quite significantly different), which consistently divides the Heroes Community into its supporters and opponents.
Of course, if the developers had continued to develop the game, it would likely have advanced much further and probably eliminated most of its inherent flaws. However, the efforts of enthusiasts, who do not have access to the game's source code or the rights to legally change anything in it, are far from equal to the capabilities of its creators. In the end, "we work with what we have!" ;) (from the movie "The Cabin in the Woods")
By the way, I recently finished a Walkthrough of one map (I want to tell you about it, but I'm not sure if it's worth it: I didn't really like it, although the battle was long and intense), where I managed to win a clean victory against the strongest enemy hero, without any losses, precisely because, during one of the replays with a different tactic, the AI became incredibly stupid, which I took advantage of (otherwise, victory was only possible with huge losses).