Then, let it be optional – if someone wants to submit their playthrough description without a preliminary announcement, that's their right. But if a player doesn't want to say anything without a preliminary announcement, that's also fine.

Sure. No one is forcing you to send a playthrough description before the preliminary results are announced. This is a request from the host to save time.
If you don't want to, don't send it.

If you write that you attacked and retreated, but if you attack, fight, and lose without retreating, is that okay?

Just don't tell me that anyone does that in offline mode... :) Why lose a battle and lose a hero and army when you can just not attack?... In online mode, I would agree. In offline mode, it doesn't make sense. Don't make things up. Every attack has a purpose. If the goal is to weaken a neutral army in order to defeat it later, that's a violation. If you simply want to "bribe" your way out in order to hire a hero elsewhere, you can do that... But there are key neutrals – they guard passages, artifacts, mines – and you can't do that with them. You can always do a "post-mortem" and figure out the purpose of the attack...

Too many restrictions are also bad. You have to sit and constantly think about what you can't do :)

These restrictions are as old as the world. They have existed in offline tournaments for at least seven years... You just want to make a mountain out of a molehill... Any player who has experience participating in tournaments knows this; if it's difficult for you to remember right away, learn gradually... :) There are no new restrictions or rules here. Instead, the entire list of possible grounds for complaints is listed. If you are afraid of receiving them, understand the rules and don't be afraid. What else is unclear? :)