In the US Pizza Hut was mostly a sit down restaurant until the 80s/90s when they started focusing more on delivery. Sometimes you can still find the sit down ones that have been there for 30+ years in rural areas because the land cost isn’t as big of a concern.
It's s different experience. One day colleagues decided to order Pizza Hut. It was raining she's they didn't want to go out. I opted to get a pizza at a restaurant instead.
I must admit here in Europe it's not common to order Pizza Hut. And it seems in our local shop they aren't used to doing it since I had the time to sit down and eat, walk back and my colleagues haven't had their delivery arrive yet. Could have been just bad luck.
In the early 80s Pizza Hut used to be sort of like a normal restaurant... they usually had standalone buildings (which now have mostly been turned into other restaurants) rather than spots in strip malls, with a seating area. You could order a pizza or sandwiches and eat with your family, and they had a salad bar back when salad bars were kind of a hot trend. This persisted into the 2000s especially in smaller areas.