Earlier quoted context omitted.
All jobs have some amount of grind. Being able to acknowledge its going to suck and push through it quickly can be super beneficial to your career. It's also one of the reasons why I encourage those in high school or college to try a non technical job first. Learn to appreciate doing monotonous tasks well.
As a manager of a dev group, I've migrated away from trying to hire "10x developers" and now optimize for "intelligent and persistent". The "10x" developers are seductive, and can supercharge a project into getting version 1.0 off the ground in months instead of years. However, each one we've hired has left us worse off than before once they got bored and left us in the weeds trying to piece together what they had do…
Fake 10x: Turns out lots of stuff quickly but it crumples under edge cases and has non-obvious tight couplings that keep biting you. No one else can make changes to their code. None of their stuff can really be used when they leave the company, but they can fix it really fast.
Real 10x: Is able to explain what they did and why bugs happened. Easy to follow along in their code, you get the impression the job was easy. You constantly find yourself turning to their old solution, when it really matters, rather than the new way everyone's trying to migrate to. Suggests ways their existing system can handle new business use-cases with only a trivial modification. You keep trying to improve upon their work but keep concluding that there was a good reason for all their decisions.
Depending on the context, someone might be referring to one or the other.