But do you think you wouldn't be more skilled if you had passion for it? Sounds implausible to me.

The amount of times I've seen passionate people make bad technical decisions in the name of trying something exciting is too many to count. I obviously agree that passion is valuable, but not without faults. I think I'm better in some ways and worse in others due to the way I approach the job.

Have you ever met certain singers at talent shows? Even if they'd be better at it than if they wouldn't have the passion, there's also a certain bar one should be able to reach.