Years ago I started to fly MSFS 2020, never flew an airplane, had to learn the basics, and what frustrated me is that I wasn't able to tell what really happened with my landing in order to improve. Even looking at a replay of the landing we don't really grasp all the details. With My FS Flights we have all the detail of all parameters of flight. It helped me to improve, showing me the reality with facts instead of feelings.
For me My FS Flights is more than that, it allows me to keep all the history of all "my flight", allowing me to create goals to pursue, like visiting new airports, visiting new countries. Also in My FS Flights I am able to keep screenshots of beautiful scenery, and go back and look at what I visited, a virtual visit, but when you fly in MSFS it's more than virtual, it's a learning journey.
Without My FS Flights I wouldn't be able to keep the motivation to challenge my abilities, creating new goals, and keeping a historical trail of thousands of hours of flight.