"The flight model" is kind of inaccurate when it comes to MSFS. They've always used a system that allows the aircraft developer significant authority to make their aircraft as simulated or gamified as they want.
IE, a pmdg boeing will be hugely better simulated than the built in boeing.
This is true in X-Plane as well though, right? I would kinda expect a better default Cessna model, though I admit that most people probably aren't going to either flight sim for lots of time in a Cessna (though I'd actually be really curious to know what % of planes are flown what what amount of time).
Not only that video is very old (there have been multiple improvements), people that are even remotely serious don't use the default aircraft which are always awful, they buy payware aircraft that are much better modeled.