I only skimmed the intro, but why bring back the problem that REST was trying to solve? It may not be strictly RESTful, but partial updates to JSON resources is

I only skimmed the intro, but why bring back the problem that REST was trying to solve? It may not be strictly RESTful, but partial updates to JSON resources is simpler... properties specified get updated, properties not specified remain as is, and setting a property undefined is akin to removal. Is that really flawed?