You'd like to think that, but no, there are plenty of dealers that will TELL you they're happy to negotiate everything by email/phone and then you just show up and get the car, but once you're there they want to change the deal and will still make you sit in a little office with someone that tries to add-on warranties, paint protection, prepaid services, etc.
You mentioned you liked dealers that don't negotiate. So I mentioned you can buy without negotiating at any dealership. The advertised price is pretty fair at 90% of dealerships.
Beyond that, their advertised specials are spectacular deals usually. Who spends money and attention advertising specials that don't even compete with the competition?
The problem is that you feel like a chump if you don’t negotiate. No one wants to feel like they didn’t get a deal especially on a used car. But the last time I bought one it was from a dealership that didn’t negotiate, a fact I discovered when I started negotiating. And then to see if it was true I started pushing pretty hard and they stood firm and the end result was great, I left very happy with my purchase.
Yes, you can, but during normal times at most dealerships (current market being atypical) it means that you left few hundred dollars at the table.