The pockets on the Fusion tech aren't ideal, but they are manageable. I have cave dived with multiple spools and a pigtail; it was completely fine with bare hands, but would have been a challenge with dry gloves. In cold water, I don't carry as many small items, and I can get an SMB and spool out of my pocket fine. Putting it back in is a bit of a thrash, and I'm sure putting wetnotes back in would be, too, if I used my wetnotes much. But that, of course, is why you have a buddy.
Putting other pockets on the Fusion skins is a challenge. I do know that several people have done it -- I believe one of them goes by airsix on this board. It was a complex procedure that involved securing the skin to the underlying bag. I was never that ambitious. For the Sport skin, I just used X-shorts, which altogether cost not much more than one of the fancy pockets, and there was no issue of how to put them on the suit.