Please define "advancement" in this context. Is chocolate an "advancement" over vanilla?
As I use it?
Looking at what works and what doesn't, learning from changes and additions to the TTRPG design sphere, and designing towards a goal in a conscious and considered way, that gets closer to that goal than previously. 2E I think could honestly be seen as at least intended to be an "advancement" on 1E, for example. Or 5.5 on 5. Or indeed most edition changes for non-D&D RPGs.
Like, some bits of 5E just don't work very well, mechanically - the three pillars is a great example - because they're seeming an important concept, but 5E isn't really designed in a way that supports that concept. So if we say that is a design goal that we want to achieve, still, which is reasonable, we'd expect 1D&D to make a conscious effort to make those pillars a bit more prominent in design, and to redesign classes, abilities, spells, etc. to allow people to engage with those three pillars more.
But so far there's curiously no evidence of that.
Instead what we're getting are say, "chocolate vs. strawberry" changes (avoiding vanilla because it has additional connotations re: simplicity, and I don't think you intended those - correct me if I'm wrong). Like the spell preparation change is just chocolate fudge instead of strawberry-chocolate swirl. It's not an advancement, AFAICT, because it doesn't advance D&D towards some kind of acknowledge or "obvious" (sorry to use such a term, I'm struggling for the right word) design goal, it just changes stuff around.