Grocery store sushi is an abomination. Part of the idea is that it is prepared and then you eat it just a few minutes later. When it sits around the flavors blur, things toughen up, the rice goes from sticky to gummy. Yuck.
Have to agree with you. Publix sushi is safer than most though.
The best fish ever was fresh mahi-mahi sashimi prepared by a trained Japanese sushi chef within hours after it was caught. I was totally not prepared to eat it, let alone like it. It was heavenly and tasted exactly like rare beef tenderloin.
By the way, the chef’s wife was a lab tech who worked with infectious diseases and she would not have eaten it or encouraged others to do so if she was the least bit concerned.
I prefer sashimi to sushi. Just not that into the nori.