'self' is absolute; not a spectrum.
'custody' is a spectrum - ranging from self custody to collaborative custody to full 3rd-party custody.
Then, there's the additional issue of what is being custodied: bitcoin or an IOU.
Personally, I think the full spectrum from self custody bitcoin to full 3rd-party custody of IOUs can have utility... it's just important to understand the trade-offs. If you can use it as money it's great. If you wanted to use it as money, but you were rebuffed for whatever reason by the 3rd-party you were relying on to honor an IOU, then that's the trade-off you chose to live with.