I can see why Bitcoin denominated debts would be important, since that would also mean well defined Bitcoin denominated payments. Now the lender has a steady defined stream of Bitcoin and the borrow has some consistent Bitcoin costs. It'll be figuring out interest rates on Bitcoin debts that will be very difficult at first.
I'm trying to take some baby steps towards unit of account thinking. For instance, on Fountain, I have a fairly predictable small Bitcoin income and I've preset how much I'm going to stream back to podcasts that have their LN stuff set up.
I've generally been an advocate for dollar-cost-averaging as a strategy for stacking sats. However, this conversation has me thinking about how buying the same amount of Bitcoin every week would provide a defined Bitcoin income.