I think throwing out the terms credit/debit is a mistake. Everyone operates on GAAP and we shouldn't deviate.
Not only that, there are some really useful properties of the double entry system: https://arxiv.org/abs/1407.1898 That's defining a group called the Pacioli Group. One thing that is relatively easy to do with this group is to quickly verify consistency in the transactions. That is something you lose with a single-entry system.
I'm really interested if someone can show me a use case where this system is less powerful / safe than a classic double entry system.