A powerful coping mechanism in people that allows transformation of pain points into substantial growth. This appears similar to Ken Wilber's concept of "Transcend and Include". See more at Positive Psychology and Growth Mindset.
Not only does sublimation allow one to transcend pain points - but based on the extreme flexibility of one's neurons - their capacity to rewire - this implies that painful tasks may be turned into tasks of joy.
How do we reconcile 'devloping one's weaknesses' with sublimation? There is no such thing as a-priori weaknesses in one's self. There are only conditions of limited practice - if we follow current scientific notions that character and personality both change over time. We recycle our body, also, on a periodic basis - we get a new skin every 3 weeks  Blood is replaced every 4 months , bones are replaced every 10 years , and even the brain goes through neurogenesis  - to an extent currently unknown by science.
In summary - people can transform and rebuild themselves completely if they want. 'Building one's weaknesses' is a completely rational thing to do, unlike what certain enterpise leaders such as Dan Sullivan from Strategic Coach says. In a growth mindset, in a post-scarcity mindset - there are no limitations. There is only purpose - and if one has it - then there will be a way. Thus, Strategic Coach appears to embody a certain level of scarcity mindset. I am bringing up Strategic Coach as Dan is a seminal thinker, but I think he's not accurate on the point of developing 'strong weaknesses'.