But that's only part of the picture. It's also important to consider how much effort they need to expend to do so, and how many resources are consumed in the process.

Truly good developers will know to discard poor tools in favor of better ones, and will be eager to do so. They don't have emotional attachments to, say, Ruby on Rails or MongoDB, or some other piece of software or service. Once the tool becomes insufficient, it's gone. In many cases, this is obvious right away, so the tool isn't even used in the first place.