This discussion was in the Kwin Matrix room for reference, i’d voice feedback there 
My big thing was that the Overview was initially intended to fully replace the old Grid+Window effects, and at first it was missing many features just to ship the new effect. Some were ported back (like hiding minimized windows, but there’s such reluctance now to add options back in. Disappointing thorn of an issue where the rest of KDE Plasma really does shine.