I plan to take my plain green strapleaved paphs down to 55 this winter (not fall). Same with micranthum, my Armeni White (both are parvis) and my Doll Goldi which also is part roth.
My only brachy (Paph Greyi) is fine without any seasonal cooling.
I think the mottled leaved hybrids are fine with no seasonal cooling, and probably the hybrids as well (?)
It is amazing the micro environment you can create by pulling down a windowshade between the room and an open window. Those windowsill plants will get that nice coolness, but the room will stay comfortable for humans.