I get there is competition between fans there, but I don't know if it's as extreme as you paint that picture. I dunno, I run 5e, and ran 4e and 3.5e before that....but I am using a Paizo Pathfinder adventure path that I am converting on the fly with 5e, and one of their initiative trackers as well. I somehow doubt a meaningful number of people would be so upset by Paizo converting an existing AP to 5e such that it would impact their sales in any negative way. You really think die-hard fans of either Paizo or WOTC would suddenly change their buying habits as a result of them doing that conversion such that it would hurt one or both of those companies in terms of sales? I can't see that happening.
Wizards did include psionics, epic levels, and divinity rules in the SRD as well.That's true. They didn't port it out to the SRD, though, and some of it came from other OGL sources in the first place, but yes a whole whack of variant rules were Opened in UA. The comparison stands; UA was one book of dozens, and Paizo's SRD still grows with every release.
Yea. IF Paizo did a Greyhawk book with WotC I don't think it'd be for the money.
Wizards did include psionics, epic levels, and divinity rules in the SRD as well.
Yep. Also some domains that first appeared in, IIRC, the FRCS.
As far as I can tell, there are no domains in the SRD that weren't present in the PHB; I don't know what FRCS domains you are thinking of.
These domains.
As far as I can tell, there are no domains in the SRD that weren't present in the PHB; I don't know what FRCS domains you are thinking of.
Not that it matters...
The point is still that fundamentally the development of 3.5 remained closed, and Wizards produced a phenomenal amount of content for the game that was never added to the SRD or quietly Opened like UA.