If you think can tell within less than 1-3 years then it's probably not. I.e. just spewing up code faster than someone else or using some technology that appears to work isn't really the test. There are those who do things very quickly, then re-do them, re-do them, fix them, all very quickly. A lot of action, not much gets done. There are things that are done slowly, not a lot of noise, but get you to a completely different place. Very rarely is this purely a question of tooling, language, editor etc.

That's not to say that being able to move quickly doesn't have value for proving a concept or prototype some idea, maybe the stability or scalability or maintainability don't matter. But when you're building stuff for the long term those are x10 factors.