The main reason you don't use electric props on glow engines is because they are not designed for the rpm and torque that a glow engine can put out, you risk injury from prop failure. Using glow engine props on a electric is safe but the overdesigned prop adds ounces of needless weight to the plane. The ultra high powered electric systems that rival glow power and rpm should use glow engine props for the same reason glow engines need them.
Today, 4-stroke engines are spinning 10,000+ rpm and higher in some cases. The power gap has really closed up so I don't think they need special props. Those 4-stroke Rev Ups may be relics of the days when 4-stroke engines had open rocker arms and only revved 8,000 rpm.