What's so special about commercial carpeting?

We just came back from a fancy restaurant where they had really nice wall to wall carpeting in every room — from lobby to bar to corridors to the dining area. even the back halls leading to the restrooms had full carpeting. each room was a different color/pattern. It wasn't new either, probably been there over 10 years but it still looks clean and feels strong under foot with no visible damage.

So i'm thinking... why not install commercial carpeting in our house? We need to replace the living and hallway areas. These are the highest traffic areas of the house like the kitchen and dining comes into the living then to the hallway. Our main entry comes into hallway then to all bedrooms and bathrooms. Is there anything wrong with this idea? What's the downside of using commercial carpeting in a house? Also how the heck do restaurants manage to keep theirs so clean?

By the way, is there a combo vacuum steam cleaner?Is there such a thing as a combination vacuum steam cleaner meaning that if you just want to vacuum without steam cleaning you can do so. I need a a good vacuum cleaner with all the different size nozzles that come with it. And I could use a steam cleaner. It would be nice to get it all in one package instead of two different units.