I level every single job, so I can related with the OP. Beside the fact that there is very little all-purpose gear for gathering, crafting, or fighting (which I limit myself to), you also have to factor in repair mats and space to stack common desirable drops. I'm already ignoring most of the holiday events because I don't want any more unique, untradeable items. Granted, who knows how armor will work with changes planned for this summer, but either way, I only see it creating a need for more space, especially for people like me.

But I do like the idea of having access to a retainer in the field. Retainers had (or still have?) levels next to their name, so I think it would be fun to have one also act as a NPC fighting companion, just like in FFXI. That would solve a lot of problems because you could carry gear for a few favored jobs to easy swapping, but then tap your retainer/fighting buddy for more gear if you want to do something completely different.

But as I said, space is already a little tight even with 2 retainers. Depending on how this new job system works and how much gear it introduces, we will probably need more space.