How did this distinction of concealed vs. open carry arise in the first place? The second amendment simply says “bear” and it seems to me it shouldn’t matter in what manner one bears a weapon. I would also think the left would prefer, if it’s forced on them, that people carry concealed so they don’t have to be exposed to the sight of the murderous devices.
In Heller, Scalia wrote that time, place, and manner of carry could be subject to regulation. Some states, and courts, have misinterpreted this to mean any regulations short of outright bans on possession in the home are constitutionally acceptable.
I'd argue the opposite about statists (it's about proponents of State authority, not purely Left vs Right), that they'd love to see the only carry allowed to be open carry, because they could then identify, harass, and socially isolate (ostracize, "cancel", shun, whatever you want to call it) carriers into not carrying at all. No carry at all is their goal.