Good point, I'd like to add another model: "people who want to ship stuff to the customer" vs "people who strive on solving emergencies" vs "people who love to create internal tools"

I.e. the first group wants a feature request and ship it fast in a package (or maybe in small steps, doesn't matter), the second group doesn't really "ship", they are reactive problem solvers - sometimes sniffing out the weirdest edge cases on a whim. And group three prefers to write the first 80% of a solution, like an MVP, improve their coworkers' happiness, but aren't so good at following through to polish the last 20%.