Up until 7 years ago liquor licenses could only be held by up to 3 locations max by the same owners / chain statewide. There are a couple grocery stores that do have beer and wine. Just none around me.
They changed the law to 5 locations 6 years ago, and now its a max of 8 locations. The issue now is all the liquor licenses allotted to each town/city are in use. So even though grocery stores could expand beer/wine to more locations now, getting the liquor licenses to do so are not available.
I remember one store 6 years ago bid $750,000 on liquor licenses when a liquor store lost their licenses for being caught selling to uderage kids one to many times. A lot of times, the chain stores.
Go back 15 years ago and sales of alcohol were prohibited state wide on Sunday including at restaurants. Bars were closed. We also had a law that prohibited beer / wine at convenience stores that has been repealed sometime over the last 20 years. I don't remember when.
Hell, I remember back in the early 90's blue laws even restricted stores on Sunday. Most were closed, somewhere only open 12:00 pm to 6pm on Sundays.