It's probably a development resource allocation problem. (aka "do you prefer devs to rework old content or make new content?")
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I would rather every expansion go back and revive some old content. Though the changes to Totorak feel like they took the wrong complaint and instead of making it more fun they just turned it into a tiny map with nothing to get lost in, when maybe they could bring back the huge 1.0 version as something between a "expert" and a "variant" dungeon that is just big and full of optional fights.
The problem is that the 1.0 dungeons were very copy-pastey open world designs, so even if they did, I'd want something that actually looks like it "aged". Likewise bringing back 1.0 Mun-Tuy Cellars would have the same problem.
Revamping 2.0 content to scale with current power creep has a different problem where say, those initial three dungeons (Sastasha, Copperbell and Tam-Tara) had different designs in 2.0 than they do now, and if you wanted it to be fun and able to use current skills on it, would need to pretty much need to throw more road cones in the way to the boss room, and that original version of the slime boss would need to be unkillable, not bleedable with DoT's, until the bombs are placed. Honestly that mechanic was pretty fun originally. The final boss likewise used to infinitely spawn more adds once it broke through the wall, and thus it used to actually be difficult with new players. If that fight scaled up, it would just result in a lot of wipes because those adds used to hit pretty hard, you were supposed to kill them, but by late 2.1 players were just burning the boss down and ignoring the adds. Same with the Sastasha final boss, where you had to prevent the adds from joining or you'd get overwhelmed.
But let's say they gave us an "Extreme" version of these dungeons which was just the original 2.0 version without all the telegraphs that were added later, but it was level 100, and every mob and boss got to "use their full kit too" which meant the boss encounters in copperbell would have stuns or "knocked down to 1hp" attacks when you don't interrupt them.