8 teams seems like a no brainer, a bye week for first seed is super awful. Last year Canada didnt get to play for a whole month last year due to tiebreaks, and 8 teams worked super well in dwcop 1 I feel like this should never be changed.
I also think that we should heavily try for 8 slots if it's at all possible. Wcop tours get way more signups than other tours (and this is gonna be a brand new gen which should boost signups) and they seem like a good way to build the playerbase and give more players a shot. Yes some teams will benefit more than others but that's wcop tours in a nutshell they will never be "fair" on paper, if we wanted a fair dwcop where every team has an equal chance on paper we might as well make the tour 1 slot. I also think people are way too quick to discredit more unproven dou players in tours like dwcop. In dwcop 1 when it was 6 slots there wasn't really any breakout stars due to most of the pool being very known players, but dwcop 2 you had players like Enzonana, Chloe and Xrn get their first big shot in a dou tour and they all went positive and all of them still play DOU.
The region that seems the most against 8 slots seems to be Europe because they feel with Italy getting their own team they won't have enough players that could field a competitive team, but I don't think this would be the case at all. In dwcop 1 Europe was even more screwed due to not only having no Italian players but also most of the Spanish players thanks to team Mediterranean being a thing. Europe ended up slotting in two more unknown/unproven players on their team in Sakura and k8sm both of which had 2-2 records and performed fine (k8sm was also in a stacked pool beating umbry and kiichikos). Europe that tour also had tonyflygon a user who has performed well in dou tours before on the bench so despite getting a lot of their good players taken away they were able to make it work. Now obviously dwcop 1 was only six slots but taking away spain takes away users like JRL, SMB, and Tenzai so I think it's comparable.
Going into dwcop 2 Europe got to create a team that was on paper a super team, yes they underperformed but on paper that team is super broken. Their team was always going to look worse with a new European region being added but that doesn't mean it's going to be bad or even perform worse than the team they had last year. Just off the top of my head potential Europe starters if they all signup are: jrl, smb, tenzai, yoda, frania, toby, givrix, lily (top cut osdt, good singles player), michaelderbeste (same as lily), and Tony. This is not even close to being a bad 8 slot team and can easily perform really well and honestly might be one of the favourites. Now obviously those players have to actually sign up and we will never be able to confirm 6 or 8 slots until signups but I really don't see Europe being a big issue for 8 slots at all, my biggest concern would be APAC but they got enough for 8 slots last year and have gotten slightly bigger so should be fine there too. I see no reason going with 6 slots unless signups are quite dire which would be concerning for a team tour at the start of a brand new gen.
tldr; This tour gets more signups and is a more for fun and uneven tour by nature of it being a region locked tour, make it 8 teams 8 slots so it's not just the same players in every team tour because a lot of these considered middling or unproven players could be a breakout hit as seen last year. Also Europe can easily field 8 slots.