This is 'poor' airmanship when considering the following aircraft, and a recipe for disaster if the situation you questioned happened for real. It may be okay at a GAAP (class D) aerodrome where everyone is doing the same thing, if you fly in the real world and do this with an RPT aeroplane up your behind, you could become an accident waiting to happen - especially if you were not making the required radio calls (which has happened to me on occasion).
i think the poor airmanship side of it comes from a lack of situational awareness, i am capable of flying an approach at 30 kts with full flap, but if there is other traffic, then no way will i do it.
and whats the reason for NOT having full flap on a C152 at 500 ft?
full flap, plus a very steep approach into a tight field? then you can do a glide approach with full flap in any aircraft.
my greatest satisfaction is a when i can glide from base, yet still get full flap out and make a 30 kts landing right on my mark with 50 mtr landing roll and not touch the throttle.