Point 2 is a good call. Hadn't thought of that. In practice, Point 1 isn't too realistic though: Front-end and back-end almost always use different build/debu

Point 2 is a good call. Hadn't thought of that. In practice, Point 1 isn't too realistic though: Front-end and back-end almost always use different build/debugging tooling, different unit/integration testing frameworks, and even different paradigms. Unless your developers are good at constantly switching modes, it's hard. "no real upside" is wrong, as you point out, but I would stand by "no guaranteed upside" :-)