For me, I don't think it's a big motivation to wear in public. It's more that I'm wearing and going about my business and some of that takes me out in the world. If I can continue wearing diapers, so much the better. There's probably some element of having a secret and having it not be the same old thing but I also know ABDLs who very specifically seek the feeling that this is normal and nothing out of the ordinary. Different reasons for different people.
When I'm 24/7, I guess it is for me as well. Still, I think the fact that they aren't physically necessary changes it a little for me. I could go back to regular underwear but I keep wearing diapers for reasons instead.You are right, for me its my normal underwear, be it out or at home ..