I guess I can't agree that people are largely lazy. We just have so much imagination, we can think of a lot of different things to do with the time we have! We have to make choices, and those will be based on personal combinations of talents and resources. Some will choose carving precious stones into intricate shapes, others will choose highly mathematical descriptions of 3-dimensional structures. If the two of them start sharing knowledge, they may make something really cool neither of them could have alone... and with neither of them truly understanding the nitty-gritty details of how the other's area of expertise operates!

Rather than laziness, think of it as the inevitable void between two worlds of expertise! They are experts in things you know nothing about, and vice-versa. Maybe there's no way to bridge the gap, but how will you ever know if you don't approach the other with respect?