I have a 1x 9s setup and am a strong rider, I ride as a courier everyday.
I recently set this up with 2nd hand parts and built the wheels myself. I noticed some slight play (wouldn't really say play, just a very slight delay with engagement) in the freehub but everything else is normal.
It's not all the time, but I can feel a shudder in the pedals, even at low speeds, like when the fender is rubbing the tyre and gives you a sensation of dragging rubber.
It's happened on my previous wheel too before some of the pawls gave up.