I know they have next to no chance of returning outside of custom games options, but while awkward in Reach, I found them very fun and tactically rich in H4. And for that matter I loved Loadouts as well, though I often disagreed with the official set-ups. I also miss the more flexible scoring options.
Ya know what? I like Halo 4. Despite how the mechanics were recieved, they made custom game creation/adjusting the best in the series. While I totally understand Infinite doing its own thing, I'd really like those options back. Except for Ordinance. Actually so long as its optional add that too. Add everything that ever happened in this series. Dual Wielding, whatever.
Have your official playlist rulesets, but give me the power to flex in custom game creation. The power to make Halo 4 with dual wielding.
As fun as it'd be to have everything back as options, there are a few things to consider.
-Control scheme: Think of how many different combinations of enabled/disabled mechanics there are, and what possible new things they may have for Infinite. Halo 5's controller scheme felt crowded with what it had, now think about having Dual Wielding, equipment, AA's and Spartan Abilities enabled, and going in with whatever Infinite might have.
-Assets: Equipment and AA's require their own assets, Meshes, code, sound and animations. Dual Wielding require single wield weapons, and having a small number of single wields wouldn't exactly make dual wielding that fun, or? Then there's the question of how to handle them in terms of damage? All single wields get a damage reduction while dual wielded? Are all single wields going to be made available everywhere else in the game? Are these single wields made soley added for Dual Wielding in custom options? And as such bloating the "sandbox proper"? Not to mention that these features also need to be tested individuelly and as groups in combinations of each other.
-Resources: i343 has limited resources, additions like these would most certainly take away from other things in the game development where those resources could be used to make the "main game" better, more polished.
-"Value": Kind of difficult for me to pinpoint a specific descriptive word for this.
Now, these features would be Custom Game options only, meaning they'd be absent from any other mode than multiplayer.
If we consider that any game up untill now has tried to make each mechanic / trait / feature something the player would have access to and be made to use as much as possible, then the value of the work put into these would be very low, as the mechanics / traits / features wouldn't be used as much.
It's not impossible, but I find it highly improbable they'd do it. Even more unlikely that they'll pull it of well if they actually decide to go through with it.