You didn't ask context, so you didn't get the actual problem for 'Should we put in a source control system?' And you came up, exactly, with the same answer all the other software engineers came up with, which doesn't take into account either efficiency or truth about what's really needed.

We do hardware tools for hardware engineers to design chips. Do hardware engineers need a source control system? Do they need it now? What parts to they need? Can we actually do it better for them than the tools they already have? Do we have the time to include it when we have to trade off twenty other features for it?

Sure, the simple answer, without asking question or questioning ones initial assumptions. Then it's easy. You can say it's true because of what you believe to be the problem. It's more about figuring out what more *is* there than your intial assumption.