Why are designers who can't fly planes not good carpenters?

Some people say that dancers who can't speak cross talk are not good cooks, while others say that designers who can't fly planes are not good carpenters. So, why is there such a statement?

First of all, it's a joke. I didn't find out who sent this joke on the internet. It is also possible that these things are irrelevant. Why are these things mixed together? Mainly to highlight the comedy effect, so as to make the audience feel funny, so as to make the audience feel that this person is a player, and such jokes will spread faster. Therefore, this joke is still a virus.

Secondly, what I want to say is that there is actually something real here. Some outstanding scientists, even Nobel Prize winners, can be excellent in their own fields, but they are also excellent in other aspects! The same is true of other excellent people, such as Qi Baishi. We know that his paintings are great, but his seals are also top-notch, which means that some outstanding people are outstanding not only in a certain field, but also in many fields.

Of course, everything in the world is balanced. If you are excellent in all these places, you may not be excellent in all aspects. For example, our mathematician Chen Jingrun, who attracts worldwide attention in mathematics, is not a very good person in life, at least not a good cook. Moreover, his attention is focused on mathematics and he is not interested in other aspects. When he took part in the NPC vote, he just raised his hand with others.

So, although this is a joke, some excellent jokes come from life. Of course, it may be higher than life. What other jokes do you have from life?