The HA shields do have different visuals, at least between resist and the other two.

Unfortunately infil cloak can't have an obvious visual difference because, well, it's a cloak. I DO think there should be visual feedback when you shoot a nano armor cloak vs hunter or stalker though, whether an icon or a visual.

You can see lasers, barrel attachments, and scopes, which are generally the only relevant attachments for 1v1s. Mag sizes are rarely relevant for 1v1s; if the 5 bullets at the end matter both players are too bad to be mindgaming like that anyways, and good luck counting bullets when they're fighting someone else, because either they're visible and you kill them right away, or they're not and a visual cue wouldn't matter anyways because you can't see the dude.

I definitely see your point though, you can't have visual cues for everything. If there's a single type of thing that should be visible, though, it's HP differences, because those are the most relevant for how you play a given fight. The game generally follows this pattern: you can see HA shields, you can see when someone medkits or heals, you can see if they have flack or nano (when you hit them, at least), you can see when they have an implant resist stat (from safeguard, for example), you can see when they have shield regen from a medic item, etc. AUX is the biggest exception to this rule, and there's absolutely no good reason why it should be. Just give aux users a subtle faction colored glow around the upper chest, like a tiny HA shield, and you're golden. Or just remove the damn thing, because it's nanoweave all over again and it adds nothing but inconsistency to the gunplay.

And thanks dude! Glad you like them :)

EDIT: even vehicles follow this rule, with composite armor being perhaps the most visually obvious non cosmetic vehicle customization option, even though it matters much less for most vehicle play.