Completely and utterly irrelevant? They are explicitly for the purpose of communicating between two pieces of hardware from different manufacturers, and obscenely simple. The entire purpose is to do the same small thing faster. Standardizing communication costs zero.
The architecture of GPUs is many, many orders of magnitude more complex, solving problems many orders more complex than that. There isn't even a slim possibility that hardware ray tracing would exist if Nvidia hadn't unilaterally done so and said "this is happening now". We almost definitely wouldn't have refresh rate synced displays even today, either. It took Nvidia making a massive investment in showing it was possible and worth doing for a solid decade of completely unusable software solutions before freesync became something that wasn't vomit inducing.
There is no such thing as innovation on standards. It's worth the sacrifice for modular PCs. It's not remotely worth the sacrifice to graphics performance. We'd still be doing the "literally nothing but increasing core count and clocks" race that's all AMD can do for GPUs if Nvidia needed to involve other manufacturers in their giant leaps forward.