So, Visor Attachments are obviously something that can’t work for every helmet, that much is pretty clear.
But imagine this, attachments not just for helmets, but shoulders, chest piece, and that’s just Spartans. Vehicles (Warthog, lets be honest) have attachments for only a single PART, like a wheel, or the window, or the bumper.
And for helmets you have a couple places for different attachments, side attachments go on the side of the helmet, maybe have multiple like in Reach though instead you can pick and choose what goes where, maybe even have one attachment on one side, and another on another side.
The options certainly aren’t limitless, but there’s plenty of possibilities to be had with attachment customization.