Another factor is that bars have to serve food and very, very many restaurants serve alcohol and may also have a bar for patrons. The lines are blurred. As well, as to your description of what you do at a restaurant, what if there is a party of 6 or 8 or 10? Not so easy to stay separated in that scenario.Fair enough but I'm only in contact with the person I am dining with and the server. The server wears a mask and I put my mask on when he or she comes to the booth. (I prefer to sit in a booth as I can scooch in and be further from the server). Table and booth seating is adequately spaced out in my experience. I can only speak from my personal experience. I don't go to busy bars or clubs. And I am only there for a short time. People spend longer periods at the mall.
And I am not constantly exposing myself over and over like I would be if I kept having unprotected sex with an HIV- infected person. But I could see that analogy working if a group of regulars keep going to the same bar every night where one of them (or maybe the bartender) is infected.
I think it would be hard for the gov't to make guidelines that would be equally fair to fit all the different scenarios and situations. As such it seems much easier to treat them all equally, keeping in mind that they are erring on the side of safety AND these measures are temporary, maybe a few weeks to a month at a time.