Yes, they are right. Do not file the nodes down too much or it will weaken the joint, making it more susceptible to breakage if the arrow glances off something hard. I used to scrape the joints down even with the rest of the shaft, but then several of them broke when they were shot, glanced off something and were torqued sideways. Now I just scrape them to smooth them up a little bit, but there still is a bump there, so they maintain their strength. I've had much less breakage since then.