I don't know where you live where there's no charge for grocery delivery, but it obviously ain't Canada.
Take my grandparents as an example. 89 and 91 years old, respectively. They've been taking every reasonable precaution they can to avoid contracting the virus because they're in the age bracket where it's fairly lethal.
Neither of them knows how to bank online, hence at the very least they have to occasionally visit a bank branch. They had their pool open for the summer, and closed it down recently for the fall. Closing down a pool requires going out to buy a variety of things. My grandmother's technical knowledge is such that she's lucky if she can access her e-mail let alone go shopping online. Hence she needs to visit the stores at least occasionally.
My grandmother had to go into the hospital for a biopsy of something or other--a skin lesion, I think. That can't be done over the phone.
They're doing their part by giving up 90% of their mobility. And frankly, even if they could live like prisoners in their own home with every need and service provided there, you seem to have glossed over my comment about people going out of their minds due to isolation. It's just not a reasonable expectation.
They should when you're comparing apples to apples. But we're not. We're comparing total confinement and isolation of the few versus masks for the many.
As for "physical as well as emotional issues" wearing masks: get a better mask. I can't stand the disposable ones, but you'll find some decent cotton ones online that don't accumulate moisture or perspiration and breathe pretty liberally. I like black. Makes me look like a ninja.