This guy breaks down just how bad the layout of the new PHB is. The cross referencing is non-existent and the subsections seem to go in the order someone thought of them. I’m sadly unsurprised that they’ve not improved on any of these problems which existed in the original 5e PHB.
Brand recognition, probably. Everyone outside the hobby has heard of D&D but none of them have heard of Pathfinder or Savage Worlds or whatever.
We can change that, though!
I own a small LGS and I have been trying since I opened almost 6 years ago to introduce more games to people that are not D&D. But it sells 5:1 over all the other RPGs I stock.