Yup, I think you are right.
Most will happily use Aptoide. I also installed Aurora and APKpure stores just to take a look.
In my opinion, a dedicated Philips Store won’t be very useful if it is not populated with a broad spectrum of certified apps for the PPMax. And once an app goes into the Philips Store, it becomes Philips’ responsibility to ensure that it works.
Actually, we don’t need a “Philips Store”. A thread like Working Apps List but without comments as suggested by @ThunderStrk will suffice. That’s my opinion.