TwoSix
Everyone's literal second-favorite poster
True, but at least for a good number of us, those games are relatively novel; I've been playing 5e pretty regularly for almost 10 years at this point. For a second playthrough of those systems, I'd be hungering for more options.It is still more options than OSE, Shadowdark or Dragonbane and lots of folks go in for long campaigns of those. I think people focus way too much on the toybox in relation to D&D.
And I wouldn't consider OSE without the Advanced Fantasy classes, or Shadowbane without the extra classes from the zines and from Unnatural Selection.
I know for some people, playing the same mechanics with a different narrative layer is enough to make the character feel differentiated; I much prefer both the mechanical and narrative layer to be different for every new character I play.