Ok, since no one seems to have any sort of comprehension skills...
Planetside 1: You gain certs as you play, gaining you experience. You then use certs to unlock new items. There's a limit to the number of certs you can have and how much you can unlock. But every maybe 3/4 weeks you can recert, gaining all that back raw and be able to swap classes or whatever.
Planetside 2: You cannot recert. But you gain a lot of cert instead. You gain maybe 1 per 10 minutes, online or offline, giving you a gradual gain to your equipment for people who can't be online all the time. At the same time, you'll also gain certs as you gain exp, so that active players will gain the gradual increase as well as bonuses for things like scoring kills and capturing positions. You can spend certs anywhere, making it easy to specialize, but also possible to spread them out into everything and do a bit of each.
So, it IS possible to be a professional sniper, but also have enough side-experience to pilot a basic MAX. Although a dedicated MAX pilot will have far more gear and upgrades and do the job better. With that in mind, I think everyone should have a basic MAX suit unlocked, so we can do whole-outfit MAX rushes, while some specialize into MAX or some into medics or whatever. Either way, having the whole group able to suit up and rush hard will be well worth the effort.
It's also not implemented but probably planned, that a Galaxy will be able to change loadout, enabling a Galaxy to decrease troop capacity and increase MAX capacity. If that's added, I will most definitely be rigging my Galaxy to sport more MAX slots, and we'll likely need a few pilots to do the same if we're going to make proper rushes. Specifically, I'd love to see as many MAXs in a Galaxy as possible, and any infantry slots occupied by infiltrators. You get your shock and awe armor as well as your devious turret-grabbers and bomb-planters. Good stealthed infiltrators could move in to soften a base, stealing turrets and planting explosives, so that the slower MAXs won't be as vulnerable to things like mortar turrets and whatnot. Not to mention that some infantry will be needed to capture a base, and I think Infiltrators will do that better.