This is actually why I'm going with an ASRock board on my next build.
Most board builders have additional M.2 drives steal from the SATA port controllers.
ASRock has made a slightly different decision.
Basically if you have a board that can run 3x M.2 drives, it basically steals the lanes from PCIe5 instead.
As multi-GPU is falling out of favor (due to pricing and diminishing returns as cards get more capable), you don't see a lot of people doing things like SLI anymore.
And, on my next box, storage space is important. And I'd rather not have to invest in a third party controller card.