Do hard worker and fast learner traits carry a debuff?

[Prometheus]

According to their description, hard worker makes a worker produce more work output, while fast learner makes them learn faster. However, does it also mean that hard worker learns slower and fast learner works less? Because If it was this way, balanced employees in this trait would always be worse than those with 3 points on either end.

[LatN's Strategy]

I like to make my support teams and marketers hard workers; Design, Development and Artist fast learners. Hard workers for Marketing are best since they do not require training...