That's precisely the problem. People shooting snake arrows out of a bow is, from a physics perspective, more ridiculous than dual-wielding lances. But the former, in your own words, is deemed as a 'cool' and is thus unworthy of an on-the-spot nerf but the latter is okay if a DM on-the-spot vetoes it. Why? Certainly no reason from a 'realism' perspective. But apparently it's just okay to subject martials to hazy double standards that don't apply to monsters and non-martials.
I don't remember reading a class feature of 'oh, by the way fighter, if your character does something that's unrealistic for YOU but not for an NPC or the party, expect the DM to unilaterally declare your action doesn't work', but thanks for letting me know that a lot of DMs somehow see this clause.