But won’t there still be a boundary? Maybe I’m missing something.
From reading some of the details on the documents accompanying the site, this is what I have ascertained:
Because there are a total of 17 ranks (it looks like there are less at first glance, but Gold for example is further split into 1, 2 and 3) the people behind these rankings are anticipating that race organisers will be able to customise the boundaries on their pens.
This means that if for example you are in Platinum 2, sometimes you might be in the first pen and grouped with Platinum 1, Challenger and Champion racers; while other times you'll find the first pen only has the top few ranks while Platinum 2 ends up being the highest rank in the second pen rounded out with the first few rungs of Gold ranked riders. And etcetera as you go further down the ranks.
So no matter where you are ranked, there is a chance that each race could be different for you - you could be a big fish in a small pond one race, then be the cannon fodder in the next, even though your rank has remained roughly the same. So with a variety of people to race against, that *should* mean more opportunities to prove yourself against better opponents and improve your ranking (or so the theory goes).
Of course this all depends on a) Zwift choosing to implement this sort of ranking system and b) them rolling out customisable pen boundaries at the same time. Which is probably a big ask given the glacial pace Zwift development happens at.