Given the premise:
Existing question/answers in the same vein/spirit:
I personally believe there's no right or wrong answer. It depends on what you're developing and how you're developing it. If you need razor-sharp performance, have an overly-complex data model, etc... skip the abstraction. If you feel the abstraction speeds up your development time, like the idea of capturing all application logic in a single codebase, etc... use it.