It makes him (presumed) 20% more effective than his coworker makes him. Overall effectiveness of the team is not being considered, but that's why his manager isn't asking him :)
> And now I'm preparing for my post-software career because that coworker is going to be me in a few years.
Which implies they anticipate their manager (or someone higher up in the company) to agree with them, presumably when considering overall effectiveness of the team.
> And now I'm preparing for my post-software career because that coworker is going to be me in a few years.
Which implies they anticipate their manager (or someone higher up in the company) to agree with them, presumably when considering overall effectiveness of the team.