Round table

If you're playing against a KMS player and you're weak, then yes, it might be an issue. But we're also considering the situation where players are roughly equal in skill in Heroes. Moreover, even a noticeably weaker player can beat a stronger one with a more favorable outcome, which often negates skill, something that's impossible in chess, where everyone starts on equal footing, except for the color.

I see two reasons why viewing save files shouldn't be allowed, while screenshots are:
1. First, there's a timer, and it's not always possible to take the same screenshot because almost every game has turns that end in the last 10 seconds. Plus, you also need to find a suitable location for the screenshot if it's not just a map overview. Viewing the map (opening the save file) is a non-game situation, not during the game, while a screenshot is taken during the game's time limit and is part of the player's actions during the game.

2. If we theorize, ideally, save files should be stored on an independent server to eliminate the possibility of cheating altogether and only load them during player connection. If they were stored there, it wouldn't be possible to open them in free time outside the game.

P.S. Regarding long games: I think a save file lifespan limit of 3 months should be introduced for seasonal games so they don't accumulate. And games that have been played a while ago and are well-remembered can be easily restored with an 8-minute timer while the opponent is passing their turn, which has become a more significant factor compared to 6 minutes.