It's not just that. Paizo have spent years, and a great deal of effort, building a very strong relationship with their fans. Their designers make sure to be active on their website forums, they make sure to communicate things clearly and well in advance, and their customer support is the best I have ever encountered. I'm actually not a huge fan of the game (too complex for me these days), but I'm definitely a fan of the company.
Equally, it's not as simple as saying that WotC are "the Man", because if we look back to 2006 things were different. Yes, there were some complainers, but they tended to be easier to spot and easier to dismiss (Razz). But for the most part they were being recognised because they had a strong product line, they were communicating it well in advance, and the products they were releasing were generally very well received.
Paizo is a great company by all sorts of measures. Great product, great employees, and they do work very hard to insure the success of the flagship game, Pathfinder. I'm a fan too. They have earned my respect, fandom, and money. But they are still the underdog, still #2 to D&D. Still given a pass on "mistakes" (choices, really) that WotC doesn't.
WotC is a division within a larger company, and the D&D team an even smaller group within WotC. I have NEVER seen a year go by without folks complaining about how the "suits" or "bean counters" at Hasbro or even within WotC are destroying some part of the game. Sure, the level of vitriol rises and falls like the tide, but it is always very present on D&D forums and in FLGS across the nation.
My favorite example is during the launch of 4E. Many fans took the choices made during 4E's development as an attack on their lifestyle hobby. And when during the marketing somebody said, "4E is the best version of D&D ever!" (I think it was Mearls), that was taken as an insult by a loud (although not necessarily large) group of 3E fans. The myth of WotC "dissing" 3E fans during the 4E launch exists to this day, when nothing of the sort happened. The 4E team was simply excited about what they were doing, and honestly felt they were delivering the awesomest version of D&D ever (at the time). Never did any of them insult the fans by telling them 3E sucked or fans who preferred 3E to 4E were somehow damaged goods.
If Paizo eventually releases Pathfinder 2.0, I'm sure most fans will love it, although not all will. But Paizo will not withstand the level of internet hate that WotC does over each choice in game development.
Hell, we're mostly arguing over a small, FREE, not really necessary supplement to 5E and the level of hurt is catastrophically ridiculous!
WotC had a lot of goodwill. Unfortunately, they've gradually lost much of it in the intervening years - admittedly, not entirely through their own fault
Kinda my point. IMO, WotC's goodwill lasted about 5 seconds after they purchased TSR and D&D and went from being the underdog themselves to the "D&D Company". And when Hasbro purchased them . . . . all remaining traces of the small company done good were washed away (all perception, not necessarily reality).