Ok so I see a decent amount of people want a Halo 2/Halo 3-esque gameplay without he armor abilities of Halo Reach/Halo 4 or the Spartan Abilities/jetpacks/thrusters of Halo 5. Ok well one way to do that is just do it and don’t explain it, however…
I think a lore-friendly way of doing that is say the bad guys have upgraded their weapons so that Gen 2 Spartan armor and shields are too weak to keep using. So the UNSC upgrades the armor and shields greatly, but this increases the weight of the now Gen 3 armor so that the new armor is similar in weight to Gen 1 Spartan armor, if not greater. This means the thrusters and jetpack are no longer viable to use outside of a low gravity environment.
Imagine this, ordinary gameplay is a lot like Halo 2/3, maybe it has Sprint, maybe it doesn’t, but at certain points in Campaign or certain areas of multiplayer maps have Zero-G or Low-G sections that you can use the thrusters and jetpack to move around.
I think the climbing/clambering of Halo 5 is fine, and I personally want it to stay. If nothing else, keep that. I’m on the fence about sprint. I would be fine with either. Halo 5 did a decent job of mitigating sprint by limiting shield regeneration.
Here’s a secondary idea that I thought up after I wrote the above. This is strictly for multiplayer. I don’t expect this to be added in campaign at this point.
You can choose which of the “movement” styles you want, but they come with pros and cons, and they are linked to which Gen of Mjolnir you choose to use. This would be chosen in the multiplayer menu kind of like how you could choose whether to be Spartan or Elite in classic Halo games.
Gen 2 Mjolnir: Halo 4-5 movement stye. Comes with spartan abilities and sprint. However, it has weakened shields and/or lesser physical health. Can carry only 2 grenades of each type.
Gen 1 or Gen 3 Mjolnir: Classic movement stye. Faster base movement, no sprint, enhanced shields and/or armor, can carry up to 4 grenades of each type. No thrusters or spartan abilities or armor abilites. Perhaps even a higher max ammo capacity, but starts with the same ammo as the other Mjolnir type.
I think it would be interesting to see a battle between people using this sort of setup. You could have faster, weaker people vs stronger, somewhat slower people.