This makes me laugh, because while the MOSFETs struggle, the BJTs are like, "Problem? What problem?"
50kRin, 20kRout
bjt wins, no contest!
20kRin, 50kRout:
neither cope
20kRin, 20kRout:
bjt again wins, no contest!
20kRin, 10kRout:
again with the bjt winning! lol
20kRin, 5kRout:
ditto