Any additional material hurts this cause
Because... why? I'm legitimately interested in why you think this. I think I understand why, but I'd like to hear your reasoning.
Because then they have a less severely limited toolset to craft their own stuff with.
I'm not really seeing a legitimate point here. All I'm seeing is "People are making things for a thing I don't like, and I don't like that."
Pathfinder is the true successor to D&D 3e. Official D&D is little more than a crazy steward throwing live people onto funeral pyres.
Pathfinder is like the western Roman Empire during its fall, bloated, and falling into decadence.
The problems of power creep and complexity that 3e had are only magnified by Pathfinder's bloat.
To speak more seriously, new editions seem to be coming out more frequently and I think it's a cash grab. Plus the BS with 4e put me off of WoTC forever. 5e may very well be better than 4e, but then Castro was better than Stalin. It won't last anyway even if it is good; WoTC is a subsidiary of Hasboro and whenever Hasboro makes anything good they always do something later to ruin it.
I respect where you're coming from, but it's important to remember the context of 5e in its relationship to 4e. 4e was panned. Across the board. This, we can all agree on. It was a Hasbro cash grab. Then, they realized that people weren't interested in a tactical boardgame labeled D&D. So, 5e was the apology game. They reached out to players, and said, 'hey, what do you want D&D to be like?' If 5e was a cash grab, then we would be seeing
far more splat books for it. We wouldn't be seeing an SRD or the Basic Rules packets. We'd be seeing splatbooks every month or two.
It won't last anyway even if it is good; WoTC is a subsidiary of Hasboro and whenever Hasboro makes anything good they always do something later to ruin it.
Hmm? Oh, yeah, I totally remember how 3.5 was a cash grab by Hasbro. I mean, have you seen how many source books there are for that game? Have you ever used half of the ones they wanted you to buy?
Don't be all high and mighty about 3.5 and Pathfinder, they've got no cleaner hands than 5e.
So now even their business model is stolen from World of Warcraft?
A. It's an example. B. It works. C. I could make a joke about how Paizo stole their business model from mobile games' microtransactions, but I won't, despite the fact that I just did.