I can confirm on both Series X and Playstation 5 that the stuttering with game mode on has finally been fixed with this update. I've been playing for about 30 mins or so and I haven't had a single stutter.
lucky i dont have this issue with 10.0 and there is not update to 10.0 4210 for me, but I have motion smoothing constant glitch out on and by that i mean motion smoothing is disable on ALL inputs and all pictures setting and it getting turned on by just changing input. in all case of glitch out it show it it as off in the menu.
I fracking regret by a TV running Roku OS. I dont know what is worse MS update or Roku updates..