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Oh, why write about something you don't fully understand? :(
I'll start with the basics.
Tournaments, in general, are divided into online and offline. The former is a game against a real opponent, and the latter is, let's say, completing a specific task as efficiently as possible. Which is more interesting is a purely subjective question, but both directions are alive and well in every installment.
So, an offline competition implies that the organizer creates a save file that participants can load. Participants must at least create a final save file with the completed tournament task and send it to the organizer. Often, save files are made daily.
With the current situation, the organizer won't be able to save them, and they won't have enough "space" to accept them all.
Returning to the 6th installment and its current state. There are a lot of bugs that are most noticeable in the Campaigns, and because of them, sometimes you have to replay not just one map, but several stages. And if we don't have a more or less suitable save file, then we have to start over. Is that interesting? I doubt it, because it's frustrating to lose your "work" like that.
Besides, the game makes unclear autosaves (at least in the Campaigns) every 10 days, which are not really needed and only take up space. To save the game after crashes, a classic one, and later two, autosaves were always enough.
I can't say for sure what the exact save limit is in the 6th installment; I haven't counted. But it's clearly not enough. There isn't even enough to make a stage-by-stage save for each level of each Campaign. Do the math yourself.