The tactics you described are far outside this game’s mechanics. Just because, in historical combat, there’d be a helmet obscuring vision instead doesn’t mean something else should in its place. Though, I’m pretty certain you’re not actually suggesting this is a net positive.
While I haven’t heard anyone clamoring for “helmet-view,” there’s plenty of ongoing interest in 3rd person view mods to be sanctioned. Moreover, this is definitely not the only thread noting that shields could benefit from a general overhaul – especially with 2.0 shaking the game up. Below is a broader discussion of gameplay (such as it is) with shields. Good suggestions beyond my personal “All I want is to see rats so I can bop them” venting: