HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Implementing the same timer in SoD would be detrimental. Because it would no longer be about saving time, but rather about excluding less reactive and inexperienced players from competing in tournaments based on non-gameplay principles.

I also find everything that changes the game's balance repulsive. The "better or worse" argument doesn't hold here. This timer would give an additional advantage to strong and agile players, while newcomers are still learning, they need to observe, think: is a griffin flying by? is a fox running by?... this is an exaggeration, if that's what you're wondering about:/
The thought of not wasting all the game time on the first few turns would be an additional distraction, creating moral and psychological discomfort. When playing with a timer (when I started playing online) and now (at 4 minutes), I finish much earlier than the limit due to nerves and rushing, and I consequently make more mistakes.
But at the same time, I can't disagree that the turn timer is progress and, apparently, useful and convenient - for players, for the game, for overall development. The only thing is that it needs to be tested and comfortable limits need to be found.

+ for starting the timer after accepting
+ request - a separate sound (or running a batch file) when the turn starts. With the sound in the game, spam is very distracting, and without it, it's not noticeable))
+ request - to be healthy, wealthy, and famous

And if, for example, one player needs to spend at least 10 minutes in battles to acquire 10,000 experience points and 10,000 gold, while another, equally fast player, needs 30 minutes, then where is the equality?

Equality exists in America and France. In Israel, which initiated all of this, there is no equality and there will not be. If you need 100% balance, play Starcraft, WoW, Half-Life, I don't know, what other super-popular games are there... in good games, they don't make balance, they make a Game, and that's what it should be.