There will be too many games, not everyone is ready to play like that...

There are only 8 rounds + the final with 17 participants. I wrote the example for 30 players.

What prevents us from identifying the two strongest players from each side and playing a 2v2 arena final with a pool of 4 races? And if we have 8 on 9 registered, wouldn't it be easier to play qualifying rounds in a round-robin tournament, as Moz suggested, with a pool of 4x2 races for each player, and one player as a substitute? Why create 4 stages?

The stages are only needed to reset the win/loss points and for repeated personal matches between players – so that there are no obvious winners in the groups. With 17 players, the 1st stage can be removed.
Substitutes are not needed at all; there will still be technical losses and dynamic players.
I'm not forcing anyone; I'm just suggesting an idea, since we haven't decided on the tournament format yet. In any case, I will play, although towards the end of the tournament, a 'feeling of non-obligation' arises.

Ps: there are currently 19 players, and it's not a fact that this is the end.