I preface all of this by saying I agree that the Chiefs need to get better at receiver.
I don't think he should get this pass because he's a 2-time MVP, 2-time SB Champion and 2-time SB MVP. He is the consensus best QB in the game and already considered by some to be the best of his era. By all accounts, Patrick Mahomes is THE Franchise QB of today's NFL. He just won a MVP with Juju Smith-Schuster as his best non-Kelce pass catcher and we see what Juju is and has been since Antonio Brown got the sense knocked out of him by Vontaze Burfict.
While I despise the "Franchise QB" title because what it really means is that the front office will use that as an excuse to skimp on talent around that person because said QB has proven they can make it work without a particularly strong supporting cast, the fact of the matter is that if Mahomes is what we all believe he is, when his head coach/playcaller is considered one of the great offensive minds the game has ever seen, they SHOULD be able to make this work. He should be elevating the talent around him like Brady, Brees, etc. did.
If Carson Wentz can put together a season where he throws for 4000 yards, 27 TD and just 7 INT without ONE wide receiver that had at least 500 yards receiving -- he did this the same year Mahomes won his first Super Bowl -- I REFUSE to believe Patrick Mahomes can't elevate people around him if he's the dominant player we all know he is.
Is it a fair expectation? I can't say it is, but this is what comes with the territory of being the standard for QB play in the NFL.