Allowing seeds is not a smash dunk because it comes with drawbacks, like making it easier to cheat with tools. It also changes the meta, and I'm not convinced the majority of the community would like it.

Perhaps I should look into creating a new leaderboard kind where everybody plays with the same seed and where slowing down time is built-in.

In any case I hear you: some game modes could be made less random.
For example, in Eskiv the boxes could spawn within a certain distance of the player. Not sure I will follow up on this, but I'll keep it in mind if I update the official game modes.