I told one of my kids it was the least impressive blowout I'd ever seen. That said, I went back and watched the game again (gotta love condensed games) and it wasn't as bad as I thought.
They were close on a few big plays (the hold on Thompson that nullified the amazing catch-and-run by DRob was criminal, and the Kelce bomb was just out of reach), and they were 7-11 on third downs and 4-5 in the red zone. I watched Reid's and Mahome's press conferences and neither seemed too concerned about it... They said the game didn't demand big plays so they didn't push it. I'm sucker enough to believe them, and actually appreciative that they'd rather make sure they win the game than put up fantasy numbers.
At the end of the day, their offense just isn't as good as it was with a great RB. They haven't been as dangerous without Hunt, teams don't have to respect the run so they can drop more men into coverage and the Chiefs can't make them pay.
I'll always be convinced they lost the superbowl last year when the released him (which was the correct move, btw). They were unstoppable with him at RB, and he was only getting better.