I's puzzled.

Reflex is not the same as a spoiler, since reflex will tend to reduce drag, rather than increase drag... afaics. I mean, the spoiler is stuck brutally into the airflow, causing turbulence. Is that right?

That's how glider pilots use reflex, isn't it? They reflex the flaps to increase their speed whilst they transit between thermals.

For a given scenario, the aeroplane with reflexed wing, will have to fly faster in order to create sufficient lift. So, the glide approach must necessarily be steeper ... which is desirable ... but the approach speed must also be higher.

I can't see how that combination of factors won't culminate in the plane sailing off the end of the runway.

I know from experience that washout increases the "landing speed" of an aeroplane. And, that's really the same thing as reflex.

Am I missing something?

My brain is now officially fading.