There were a few times when I have actually lost control, without protection. At least twice, over the last 10 years, night time accidents were involved to the point where laundering was mandatory. That is rare, however. But there is a risk when I go without. So, aside from the autism, the sensory processing, and condition of my skin, for me the diapers would have to be a requirement I guess.
My main problem is, I have not learned to toss out my regular underwear yet. It may be very likely that my doctor will recommend doing just that. Otherwise, there would be too much confusion over what to wear over the coming day. And if I don't choose the right garment, that could lead into a bad situation. If there are only diapers and no underwear, then the decision is a lot easier.
None of this came from wearing the diapers, by the way. So, if you've never had an episode related to incontinence, then it just deals with personal comfort. In that case, you are free to determine what makes you feel best. If it's an ABU Space, then it's all good. But then, you also have the option of "putting on the big boy pants" when it is deemed necessary. And that luxury can't be all bad.