I think the core problem of this thread is the assumption that mining is just mining. There can and shall be only one way of mining.
In contrast, i see two very different ways to go for mining now. The one is what's been described as "motherlode -> motherlode -> motherlode" here more than once. That's a gold diggers way of doing mining now. You head out for the big reward. Just like in old times, where gold diggers disregarded rather big deposits of copper and iron and just were out for gold, the new soldier of furtune disregards stuff like Bertrandine or Painite and only goes for core materials.
But not everybody is a soldier of fortune. The constant worker rather brings his mining lasers, abrasion baster and displacement missile. He doesn't rely on luck as much as the first kind of mining and still makes his profit. And mind you, this way of mining also makes good profit. A good deal more than before the patch.
Of course, currently the traditional way of mining, now supported by abrasion blaster and displacement missile, makes a good deal less money than the new methods. But prices are already falling. The same station, where i sold void opals for over 1.6 millions each before Xmas by now "only" pays 750k per ton. Just before Xmas somebody from FD stated that they consider current prices an odditiy, due to the reset of the BGS and things not having themselves sorted out yet. And alas, the very same thing has happened: prices are falling. And that already happened between Xmas and new year. So unless developers were sneaking into their office on the Xmas celebration days, it must've been automatic mechanics doing that.
So yes. I also think that currently the payments of core materials are very high, compared to traditional mining. But i think that prices will normalize even more. There'll still be the occasional gold rush here and there, depending on how the BGS swings. But in my eyes that's part of the fun. So currently i wouldn't want big changes right now. If core mining is still vastly superior in several weeks, it's a whole different story.
On the whole rest of the thread: yes, i also agree that the PWA is a bit of a strange beast. The whole "lights up depending on new mining features" feels very strange to me. It's a very open and raw game-mechanic tool which makes absolutely no sense from an in-game perspective. But the proposed change from the OP is the other extreme: it would be an absolutely logical tool from in-game sense. But from the view of game design, it would just collide with the prospector limpet, while taking away a tool which supports the new way of mining.
I have no elegant solution for that at hand. So i guess for the time being, the "crude but functional" is better than "elegant but collides with game design".