The concern is more just getting the Aetherpool in the first place. Putting it as a guaranteed drop from PotD just encourages people to actually participate in the content. It's utterly disgusting doing Palace these days from absolute scratch for the general player, regardless of the level you actually decide to start doing PotD. The point is you attach guaranteed drop rate to incentivize people actually doing the content more, and if so desired you could have it wherein, Floor 51-60 is guaranteed 1, and then 2 for completing floors 91-100, with 1 per each set of floors 100+. Doing the floors is easy until 170+, but that isn't the point, nor is that the issue, it's the required effort to get to the point where you can do that which needs to be factored in.
It's better to have people doing the content, even if the goal is slightly watered-down to the "Lul just gimme an artefact in 10 minutes plz", as you say - Especially when the relic is from an older expansion in the first place - Than it is to not having them do it at all, and by this I am referring to the number of people that engage with PotD where general players are most likely to also see benefits from approaching it like this.
As it stands, I would argue from their approach to relics, this is one of the very few where it has gone backwards. e.g., they've typically nerfed relics to compensate for the fact they won't be the relevant content, even if people still do engage with them. In this case, they've left it completely unchanged, and has only resulted in it being more tedious than it previously was.
Besides, doing it this way has cascaded benefits for other groups of players as opposed to just those doing the relic itself. Sorry for all the edits, I could only quickly write down notes, and edit them along the way.