For example imagine spending millions of pounds on a spartan but they cant even use the sights of a gun or even run
You put a severely augmented human being with increased strength and reflexes in an exoskeleton which further increases that being's physical capabilities, yet the exoskeleton can't for all it's advanced tech, allow the user to keep their gun up at all speeds?
Also, as we're talking advanced suits.
A spartan doesn't need to use the sights. See the crosshair on your HUD? Which is roughly at the center of the screen? That's what the spartan see. It's like a laser sight.
I would also like to see them add the ability to swim, or at least swim with a specialised suit, as again it just makes more sense
That specialised suit wouldn't be armor.
It'd be light body protection.
Your spartan's density is far higher than that of water.
Heck, I'm even uncertain if a Spartan II would actually be able to swim after agumentation, without a suit.
Fat float as its density is lighter than water, a Spartan does not have much body fat I'd imagine, and they've got an augmentation which increases muscle density further.
Then there's the skeletal coating, if that'd affect the density or not.
this could be added to the game in a power up
Very few games provide water combat, and here's the question, what exactly would swiming provide Halo?
or even by having selectable loadouts, having selectable loadouts would be awesome because it gives us more freedom on how we play the game, the customisation of guns would also be pretty cool as then another aspect is added to the game that make it more strategically based
We already had that to some degree in Halo: Reach, and then more in Halo 4, those didn't go down too well with the community.
The "freedom of how we play" is questionable at best, as you'd have to have some some Hero shooter style loadouts for that to be closer to the truth, as loadouts in previous Halo games have had you grounded in the same gameplay mechanics with some slight changes here and there carefully applied through the loadouts. Sure, Armor Lock vs Jet Pack game styles are most likely somewhat different, but that would be nothing compared to say, Mercy gameplay vs Hanzo in Overwatch, and I've probably played a total of 3-4 hours of that game.
The strategical aspect of Loadouts is also questionable.
however this would stray away from the original games but it is no longer Bungie in charge and this would be a good way to set 343 on its own path with Halo rather than coping what has already been done.
Myes, the irony is rather heavy here.
i343 was created by Microsoft to continue the development of further Halo games, one would expect that if Microsoft would've liked some other IP created, then a new IP would've been created. Now of course, it's not about the game, it's about the money, that much was clear after Halo 4, and the development story that's been told regarding i343's first Halo build.
Now, i343 have an issue with having its own path for Halo.
For Reach they made an update which changed quite a lot for what many believe was for the better, like the No Bloom part, and the Armor Lock nerf, and so forth.
Yet, with Halo 4 they made a u-turn and took it to "modern shooter" town, after that, with Halo 5 they steered in on another road, abandoning quite a few of the concepts they had going for them in Halo 4. Before you blame the "nostalgia tards" and our feedback, keep in mind that i343 is under no obligation to follow any of that feedback, they could've easily doubled down on Halo 4 with even more new stuff.
As for "copying what's been done".
You suggested loadouts, we've had that, and it was largely removed.
Halo 4 copied, and altered a little, of what modern shooters was about in that time and age. No, CoD didn't invent these features, but pretty much every addition and change in Halo 4, can be found in some way or form in CoD, down to Grenade Indicators, Perks and Flinch.
There aren't actually many who speak for a new Halo game which is a carbon copy of any of the older ones.
Merely that the devs take the classic Halo gameplay, and use that as a base, while not going with this "modern stuff" ( sprint isn't that modern to be honest ), or otherwise following trends.
Mario Kart isn't becoming Forza Horizons, Gran Turismo or whatever other popular driving games there are.
You'll find more games failing after abandoning what they were from the start, copying popular games of their time, than you'll find succesful ones that did the same thing.