There might be something else too. Besides being more comfortable moving and walking in shoes (for myself anyway).
I have had foot problems.
Gout. Wouldn’t wish it on anyone. Horribly painful.
Plantar Fasciitis. This is a fun affliction. Micro tears in the ligament in the bottom of your foot. When your foot is relaxed as you sleep they begin to heal. The next day, as you walk they tear again. I came down with this when my Wife (the marathon runner) and I visited the Smithsonian. 4 days of walking and standing in line. I was pretty miserable. Thought I just had ‘sore’ feet so I stuck it out.
I’ve sprained both ankles. Badly. My toes turned purple from the blood leaching out of the torn tendons and muscles. I sprained one twice. My ankles are pretty weak now. No more volleyball for me. 
At the moment, everything is fine. But the fasciitis and the gout can come back. Wearing shoes has nothing to do with gout, or probably the fasciitis or sprained ankles. But I’m a bit sensitive about wearing shoes.
We go to a Christmas party once a year sponsored by a very sweet woman my Wife works with. About 35 people. Pot luck. Shoes off policy in the house. Like about half the people in this thread, the shoes on people sort of grumble about it.
Work mates remind each other quietly ---- “Remember, no shoes, might want to bring some slippers or something, or at least make sure you have warm socks on.”
I don’t have to wear shoes, but I prefer too. And I’m sure our host would be fine with it. She is very gracious. But I’d look like a jerk. As a guest, I abide by house rules.
Another thing that is a bit crazy about this party. As a kind of work sponsored event, it has an ending time. 35 people all crowd around the little mud room/entry all waiting their turn to get in there, share the bench and find their shoes. It can take 20 minutes just to leave.
Just seems silly for adults. It’s a floor. It’s carpet. It’s gonna wear out. Taking good care of it is fine. Take care of a good tool and it will last for ever. Take good care of a carpet and it’s still gonna wear out.
Shoes off in an oriental culture (or whatever the PC term is today) seems to be more about respect for deep, deep cultural influence and way of life. Shoes off to save a tiny bit of wear and tear seems to be a bit over the top.