After 10 years of pondering why some people struggle to throw forehands, watching video gave me numerous new insights.
Every ultimate player who wants to play at an elite level needs to watch some basic footage of themselves. Start with throwing. Then you can move onto game footage, and footage of other skills like marking, guarding, positioning for high discs, cutting and laying out.
Even better: organise a videographer for your team for a training or tournament.
Replay and slow-motion give you a chance to see what you only glimpse in real time.
There's a reason dozens of people around the world get paid to edit footage of sports for coaches: video helps you learn how you and your opponents play. And feedback is critical to improvement.