Reach was a military planet, and as such, provided access to prototype armor abilities. While John does not wear Spartan III armor, that does not rule out the possibility of upgrades, especially on a Forerunner planet with active machinery and the strong possibility of human presence and adaptations of existing tech utilizing Forerunner inspiration.
He has a thruster pack, as do all Spartans, which allows for better maneuverability in weak/zero gravity environments, but it is useless in normal situations. Bubble shields trump drop shields, they last longer and don't require a loadout. Since Sprint is something that any high school athlete can do, 26th century supersoldiers should at least be able to jog.
Armor Lock turns you into Gandolf, but not always in a good way. Realistically, since you are overloading your shield generator, your shield should be gone and need to recharge upon exit. Invisibility is possible, but would be better implemented as a pick up to use at your discretion, but without a built-in radar jammer or poor stability. Hologram is only used as a joke, and few people fall for it. If the Hologram simply mimicked your movements, it could be useful, but as is, it's pointless.
If we want to keep the dynamic flexibility of Reach but not make it a cheesy skill-deficient introduction to a new trilogy, things need to change. This game will take place years after the Fall of Reach, and no doubt the UNSC has improved it's earlier formulas. If it is to play like Halo but still be new, equipment is required.
Jet-pack needs to become a universal thruster pack for weak/zero g. Bubble shields become pick-ups, as well as invisibility (except for the higher ranked Elites and the Spartan III's since their SPI armor comes with it). Sprint/Dodge should just be incorporated into the natural movement. Unless Hologram gets some kind of attention, it will be a neglected pick-up, if even that.
Armor lock is iffy. It's endless entertainment for preventing splatters and it has the Spartan-esque BA look and feel, but it's akin to pushing your armor to the limits as a one-time risk. When Spartans rained from the sky in the Fall of Reach, they manually tweaked their normal armor settings. John's armor locked up on his return to Earth, automatically or manually, I don't know, and it saved his life. When Cortana pushed John's nuclear backpack generator to the limit just to teleport on the first Halo, she said that they should only try this once, and John had to get an armor upgrade at the beginning of Halo 2. Rerouting and pushing your armors power to it's limits can have amazing results, but as a 2 ton cybernetic supersoldier with every other skill at your disposal, how often do you really need to do it?