[kradroy]

I disagree that "closer" is a distinct class. It's a necessary aspect in any class. In most companies if you don't "close", you get fired or put on a PIP (and you don't get coffee). There is another class that at some companies where closing isn't necessarily expected: "tinkerer". They just mess around with various projects to learn and make suggestions, but they don't have to close to keep their job.

[astrodust]

I'm trying to distinguish between responsibilities and obligations, which you're forced to adhere to, and affinity.

Anyone can close if they're forced to, but some people actually like it. Clear objectives, solutions need to be focused, etc.