What do you respond if LHO opens 1D, partner doubles, RHO passes, and you are 4-4 in majors, not strong enough to jump. (Also, not specifically 4=4=0=5, though I expect your answer would be the same even with that pattern)
If a 2D bid works for your partnership, OK, but I don't expect to adopt that style.
Benefits include:
Plus... it's free!