I've done similar tests with my nylon monofilament threads on practice pieces and have not noticed any issues. On the other hand - one of our scout moms was sewing rank badges on with fishing line so that she didn't have to try to match the colors... and every time she ironed her son's shirt, the patches fell off because she was melting the threads.
When I learned to use a sewing machine several decades ago, I was never told to clean the feed dogs or the bobbin. I'm pretty sure that machine is packed with lint and probably felted under the feed dogs (will try to take a peek when I next visit mom's house). So it was not that lint didn't happen - it was that I didn't know to look for it.
I think it was in a machine care class that the teacher told a story about a client picking up their newly cleaned machine and calling the store to complain that the felt pad for the feed dogs was missing. The technician gently recommended that she try sewing without the pad and see how she liked it...
Cheers, K