Well, that was fun
Nah, that's a different thing. That's about entire product lines designed to not interact with each other, thus - as you say - splitting the customer base. Everything Paizo does with Pathfinder is one product line, and suitable for all of their customers. While not everybody will buy everything, there's nothing that's useless to them by design.I agree with you but its also the same argument for why TSR put out so many settings that popular consensus says was their downfall.