So that issue is more for you guys with the little nozzles and tiny layer heights. With the big 0.6 and 0.8mm nozzle diameters and the thick 0.4-0.6mm layer heights let me tell you that 1.75mm diameter filament moves pretty darn fast in relation to the extruder sliding around on X and Y.

On the filament side there is 7mm worth of filament travel required to trigger a pulse.

I guess if we were printing something small enough and at like <1mm layer height we might even get into whole layers before a pulse gets missed. But I'd say overall the BTT sensor has pretty good resolution..