No way anyone wants to hang out at McDonald's. If they're trying to make McDonald's a third space they need to do some remodeling first. Restaurants aren't warm and appealing; they're hard and easy to clean.
As others have suggested, you have a narrowly scoped view of the world and the use of McDonalds in it. While my city slicking McDonalds trips are usually not great, for many it’s actually very good.
Photographer and author Chris Arnade has written fairly extensively of his travels around the “forgotten” parts of America, which frequently lands him in McDonald’s stores that do serve as a community third-space, https://www.theguardian.com/business/2016/jun/08/mcdonalds-c...
Yeah, it's tough to sell "gather here for warmth" when the chairs feel like they were engineered to speed-run customer turnover
Basically, "Clean with a hose" decor.
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The one near me is always full of old people just hanging out. They use it in a similar way to many kids with starbucks, but they speak to each other instead of using laptops.