CCP has made a great many changes specially against multi-boxing. Marauders got a HUGE defensive nerf specially because they were being multi-boxed. It was stated that way in the patch notes.
Mining was meant to be a team sport. It was advertised as a fleet activity. One of their earlier advertises described it as mining ships doing their thing while a freighter runs back and forth with combat ships standing by for defense. None of that was advertised as multi-boxing.
As for solo mining, thatâs doable also. There is nothing stopping anyone from mining solo to the maximum capacity of his or her mining ship. The only exception is the new prismatacite.
But then, you can easily anchor that new phase structure with a single Rorqual and then you can use drones. See? Solo mining. Skilling up to the Rorqual is not difficult. Even I can fly and fit it. I have no plans to ever get one, but I did skill up to it.
You can solo mine anything in this game.