I'd have to just add here that being a VERY avid blurless/desaturate user, now I tried just blurless and I'm starting to love it very much:

1. animations are EXTRA seamless (almost iOS like). most probably because the desktop doesn't have to switch saturation/blur and remains as it is throughout any animation.

2. you can actually see the background activities compared to desaturation where the last frame is frozen. To illustrate, If you're charging the phone (with the charging battery icon animating) and your vkb pops out, if you have desaturate on, the battery icon is froze to the last animation where it was. Whereas if you use JUST blurless, then you can still see the charging of the battery icon even with the vkb popping up.

IT'S DEFINITELY SMOOTHER THAN EVER BEFORE with just blurless!