Yep, once you grind your own, there just seems to be something missing from store bought!
Bingo,we have a couple older Kitchenaids with the meat grinder and they handle all my needs,Ive 'heard' the newer models arent as robust,FWIW. But the point is,grinding your own burger I have done now I guess its decades.
The safety aspect(meat from one animal,vrs a tub made from 100's),plus price,makes your own burger unmatchable by store bought.
Congrats,as Cliff says,welcome to the dark side,you will never go back.