Each time I recreate an old game I quickly realize that the gameplay which entertained me as a child/teenager is rather unbearable for me as an adult. HoMM is this type of game.
I don't think this is universally true.
For instance, I still can play Masters of Orion 1. And simcity, to some extent; but specifically civilization 1.
Whereas those modern games with a 3D engine I can not play. It is always the same game. Just taking away my time.
I still enjoy Morrowind. And I've replayed Ultima IV, although it does get grindy at one point. (For one of my play-throughs as a kid, I got the grindy part and simply boosted everybody to level 8 by editing the save file.)
But, as an adult, I don't really make the time for games anymore. I've been sitting on Baldur's Gate 3 (maybe an hour or two in) for years.