I just think that if you only have a giant page of loadouts it could become overwhelming for some players. Especially when your selecting your character before a mission.
My personal solution involved linked character slots that unlock as you level each character, than a number of universal slots, like we have, usable by all characters. With that, the more you use a character the more slots you have for character specific loadouts. Because as you become familiar with each character, you discover that different helix options work better with different gear loadouts.
Each could have (x) amount unlockable, and if you want more they could still offer additional ones in their market place. When selecting your character’s load out you could have:
(Linked Window) [GAP] (Universal Window)
Something simple that’s easy to navigate without being overwhelming. That way you would have access to loadouts usable by all characters, and loadouts tailored to each character.
The reason I originally mentioned 3 linked loadouts per character, I figured you could have 1 for group PvE, 1 for PvP, and 1 for solo PvE. Or 1 for offence, 1 for support, and 1 for defense. Basically something allowing each character to have a few specialized loadouts for different roles. Than universal loadouts to test different gear setups or for sets that could work with anyone.
Either way, they could make things more convenient and still have room to offer additional spaces for purchase.