It means that the first round doesn’t mean anything as it is literally a seeding round and it doesn’t mitagate a dicing as it has no effect on the actual knockout rounds.
It might even encourage people to lose the first round to get on to the easy side of the draw.
We did a similar thing over at BBTactics for qualifiers. It worked there because we had 2 tickets so the winner of the winners bracket got a ticket and the winner of the losers bracket got a ticket. If you do a grand final between the winner of the winners bracket and the winner of the losers bracket that extends the whole tournament by a good month with the winner of the winners bracket having to wait that month for the losers bracket to play out. I don’t think that lends itself to a compelling tournament.