Currently I bag 4 different Pilots: Electron Soft, Electron Firm, Cosmic Neutron and Proton. I may change out the Proton for an Eclipse that' I'm going to get as part of glow round player pack.
I actually didn't intend to bag all four of them, but the electron firm is taking its sweet time beating in. Like, a very surprising amount of time, and I don't think it's likely to ever get as beat in as the soft one did after 18 holes of a one disc round. Once they are fully beat in, I don't expect I'll need to cycle anything. But just about any loss will be easy to replace with a stock disc that I then beat in again, especially as I'm pretty committed to the mold now and have lots of backups that I won't leave on the shelf.
So mold minimalism, but not dependent on plastic that changes so quickly/drastically as it beats in.
As to the question of base plastic and grip, ISTM that the current gen of plastics from the newer manufacturers just isn't nearly as slick as some of the stuff from Innova and Discraft. Maybe that's a misconception on my part, as I haven't really gelled with any Innova discs and haven't bagged them for any period of time. Also, I don't know that I've yet played a round that's full on raining the whole time, at least that I recall. Just haven't played enough tournaments, and haven't chosen to do it voluntarily.