Do fast food resturaunts even have flat top grills anymore to fry their burgers on?

I was thinking back to my first job, in the 70’s, at Sonic. We cooked the burgers on grills. Whole potatoes were delivered and when it was time to make French fries we put the potatoes in some sort of rotating drum that had roughened sides. That was how we peeled the potatoes. They all still had some skin on them when we fried them.
We buttered our buns by holding them against a rotating rolling pin kind of thing. As it spun it picked melted butter up from a bin below it. Then we’d slap the buns on the grill too.

I know the restaurants have fryers, because I can see them, but now that I’m thinking about it, I don’t hear the sound of meat getting slapped on the grill, and the sizzle of it getting fried any more. Do they get them precooked now, and they just throw them in a microwave?