Counterpoint: I have indoor-only shoes, and I feel a lot like Mr. Rogers when I put them on. I put them on while working from home because it dramatically increases the likelihood that I will take a break and walk on the treadmill during work.
This is what I do. They're technically "slippers", but they have actual soles so I consider them slip-on shoes.
Here in the South we call them "house shoes".
I love my pair of house shoes. I think I like my winter ones more and was sad to put them away in February.
I just run on my treadmill in socks.
does this not cause grip issues?
People run marathons without shoes, so I don’t think grip would be an issue.
Not at all, the treadmill is pretty grippy. I'd do it barefoot but the rough treadmill surface actually gave me friction burns the few times I tried it.