Court Tennis

First, I can't find any literature (scientific evidence) about why tennis shoes don't scuff while others do. I swear I've had black soled non-tennis shoes that didn't scuff before...

Second, I can't find any evidence that scuffing actually damages the court surface. Seems to me that it just makes it look ugly.

My questions:

1) What are tennis shoe soles made of? Are they always made of the same material? Are non-tennis shoe soles ever made out of this material? Why do other shoes scuff while tennis shoes supposedly don't?

2) Is there any literature out there about this? Where?

3) How does scuffing affect the ability to play competitively on the courts? Is it just an aesthetic problem or does the shoe sole material somehow chemically react with the court surface or something, leading to failure or the need to resurface?

Thanks!