...of a suggestion, and have applied "Don't be an asshole" ethics to it - like, "Yeah, yeah, you want us to wait patiently for maximum safety, we get it... but as long as we don't bump into someone (or blame you if we slip and hurt yourselves), no harm done, right?" And to a large extent that has been tolerated. But now (perhaps because of aging populations) there's more pushback - "Actually, there IS harm done when you brush past me, because it throws me off-balance, which is stressful...