For the record, as I learned carbon printing, I intertwined working on the exposure/development of the film as part of the process. I am loath to separate the two (film/process) and their interaction in creating a print. Later learning platinum printing, I used the same methodology. Fgorga makes excellent points, they just do not apply to the way I work.
Yes, I have lost non-replaceable negatives to the process. I accidentally ripped in half a very nice 11x14 negative in front of a workshop...not a happy moment, but an excellent teaching moment. But remember, it was the habit 'back in the day' to decide if a glass plate negative was good enough to print. If not, it was scrapped and the glass re-used. A negative might be judged as a 20-print negative...no more than that might sell. Twenty might be printed and the image scrapped off and the glass re-used. Negatives are not holy relics. Crush the Cult of the Negative...I can say only positive things about them...
I also do all my cropping, burning and dodging before I snap the shutter. That way I don't have to do any while making 1-hour contact prints under UV light. And making only contact prints from camera negatives keeps everything the same size, more or less.
Lastly, by using camera negatives, I make a lot more interesting mistakes. Now I could probably make as many mistakes with digital negatives, but something tells me they might not be as educational or hint at new ways to look at things. Or at least to my tastes...YMMD.