Again, it has always been thus.
Look I constantly use 3pp. The campaigns I’ve run since 3e started have always featured lots of 3pp content. Scarred Lands, World’s Largest Dungeon, Primeval Thule. Hell the first WotC module I ever bought was DragonHeist.
I’m a long time 3pp fan. I get loving 3pp.
But outside of a tiny handful of us? 3pp might as well not exist. It just doesn’t even register. I constantly rail against this but it’s the truth. For the overwhelming majority of gamers, if 3pp vanished tomorrow they wouldn’t even notice.
And it has always been like this. I don’t understand this perception that 3pp are somehow more visible than they are. Think about it this way- a million dollar kickstarter is huge news right? And over the years there’s been quite a few of them.
How do you think that compares to the least popular WotC title in the last ten years? This isn’t me being some WotC fanboy. I’m asking a serious question. If you picked ten million dollar kickstarter titles - any ten at random - and the worst selling WotC title, which do you think would be more recognized at random tables?