They've had a lot of practice! But even without that much practice, it's a lot of fun. :) I grew up on d20 systems (D&D 3.5), and in college started moving towards other systems (White Wolf, etc), and my friend who got me into FatT got our gaming group to try some PbtA games. It's a really nice change of pace, and for groups like mine that like storytelling more than "How big a number can I get?", it's satisfying to play in a system that biases towards "make things interesting". Bonds and alignments are great and I just want to stick bonds and beliefs into literally any game I run now, because they help define characters so much.