Yeah, one of my biggest "if only" feelings about Rollplay is how every series or game they play is planned to be temporary or gets cancelled if it isn't so we miss out on like 50-75% of mechanical character progression. Lots of cool things and game design aspects of the game get lost to this.
Rollplay's also always been a bit slow to progress, level/xp wise, which slightly exacerbates it. Or you have games like West Marches which the constantly rotating cast made leveling past 3 a herculean effort.
Maybe CoS, as their bread and butter D&D game, will finally break that mold.