Orca Ore Compressing

It’s been a while since I played. When I started back a few weeks ago there were some changes to mining and the Orca. Apparently we can compress Ore/Ice/Gas in the Hold while flying. And I’m all for it. Got the skills queued, and the Equip ready to be installed. I’m perfectly fine with the change, I just don’t understand it.
I don’t understand the mining “waste” mechanic, or the Compressing. Not the actual workings of it, but the reason for it. Does this massively change the Mining for most miners? Did CCP do this to balance something, and if so what?
I’m not complaining, I honestly don’t understand and was curious.

I actually see someone else asked the same thing. This is an unneeded thread. Mods, can you please Lock this thread? Appreciate it.

Closed by request of the Op.