Bruh, that's damn near any producer after they've been in the game for 20 plus years
After the outstanding run he and Chad had in the late 90's and early to mid 2000's, styles and sounds changed, producers hit points where their ideas are connecting with audiences as much or just any and everything moves in ebbs and flows
But all in all, Pharrell has done pretty good.
But no producer has been the game for as long as he has and not had some misses, that shyt is natural, it happens
After a legendary run, Stevie Wonder started making less than stellar music
No producer, writer, artist, stays on top of the their game forever.
That last N.E.R.D. wasn't good imo
The Kendrick joint was nice and yes, that Voices of Fire Gospel joint is nice too
It isn't about being on top of their game. There's a big difference in the quality from the time Pharrell dropped his first solo to now. That album had some highlights as did some of Hell Hath No Fury, but it was a noticeable dip in quality in comparison to before.