Best steak I ever have is simply going to a BBQ. Assuming the host has decent BBQing skills, any decent quality grocery store steak with the right marinade will beat any steak house. Shit, I'd put up a Costco steak BBQed by a buddy who's good at BBQing vs. any restaurant. As long as the cut is the same to ensure the quality is similar, I'm confident the 3-4 gus I know who are really good at BBQing would make a steak better than 99% of the steak places out there.
And not only that, they will grill it how you want.... not how the snooty chef in the back wants to make it.
No different than your mom's home cooking.
Mom and dad can sometimes create awful dinners where they scramble to make whatever food is around into a hot dinner, but when they have the time to do it, no restaurant beats a home cooked meal. And amazingly, it's not like they are trained chefs or buy expensive ingredients. They just go to the store and buy whatever is there. And somehow it turns out better than trained chefs using expensive equipment.
And even better than mom's, grandma's home cooking.
There are zero restaurants in the world that would beat my mom's/grandma's home made apple pie. Zero. And they aren't even trained chefs.