I see all sorts of answers online, but am not fully convinced. I tried finding some research on the longevity of clothes between wash and wash + dry. Considering that it dries for hours just the mechanical movement should damage the clothes I would assume?
My lint is always the color of the clothes in the dryer.
If yours isn’t, I’d start by deep cleaning your machine. Take the back panel off and vacuum any lint throughout the whole thing.
If you think it’s burning it to make it black. You’ve got a potential fire in your future you need to address.
Well until very recently I had a shared laundry set-up, where I was sharing two laundry machines with everyone in my apartment building. That might explain why it’s all black. I don’t think its actually burning theres probably just a lot of gunk in the system