I don't know yet how good or bad that Minerva movement will be made / finished but if it would be a superior piece I would say it's worth a lot more than the Angulus. If Panerai would offer those titanium Rads with a Philippe Dufour movement, I think nobody would say they are too expensive. Even when it's only a titanium watch with 3 hands.
So yes, I think the movement is very important.
Why is a Lange or patek much more expensive than a Rolex ? All 3 of them will charge a lot for the name on the dial but the biggest difference is the level of finishing so why would it be wrong if Panerai wants to offer a very high end piece with a superior movement.