Other than rings though, armory space isn't a terribly large issue once you get a bunch of the classes to cap. It's annoying when you're still leveling and have various set of gears at various levels and stuff but once you're at cap, you really only need a few sets, like 5(tank/heal/int DPS/dex DPS/str DPS) then a few more slots for like accuracy gear or vit/str gear for tanking and so on, but all in all, you barely use half of it, and then crafting/gathering is like one set for everything nowadays so that's super simple(kinda sucked back when it was AF for every class though).
I thought they said something about a retainer for free, but it's not in the prelim patch notes. It could be a quest reward though and they might not have mentionned it because of that. I pay for an additional retainer, still less expensive than a "normal" sub with the limited sub+retainer fee, so not a huge issue imo, and I keep a lot of garbage that I could realistically sell and not bother with.
I actually sold a bunch of the stuff I had, my first retainer had like all those crafting monster drops like imp wings and megalocrab shell and so on, but in the end those are only used in very specific stuff and they're all dirt cheap so I cleared most of it out. I kept all the gathered materials(and dungeon/gc stuff) on my 2nd retainer, that one has like 2slots free but I have even the low level stuff I can buy for cheap from beastmen vendors and so on, just cause I don't want to have to run there everytime.
I think overall inventory management isn't so bad once you're at cap, it's pretty crappy when still leveling and need to keep a lot of stuff "in case of" and you're not really rich enough to just throw it away and buy it back later if you need it. As you get higher levels, you need less and less space, besides glamour(which I guess if you're into eats all your slots easily).