X-plane is also pretty bad for this. It has VOR and ILS tutorials, but nothing more advanced navigationally (like navigating to the intersection of two VOR radials), nothing about crosswind landing, nothing for the more complex aircraft, etc.
However, the flip side is that the simulation is generally realistic enough that you can use instructional materials for real world piloting. The VOR frequencies match the real world, the real SIDs and STARs are in the simulated Garmin GPS, etc.
Have you come across “How to fly”[0]? X-Plane does have some guides, though they tend to be maybe too expansive sometimes.
That aside, there are folks who work on their pilot licenses and stream flight sims, I have learned a fair bit from watching them on YouTube.
Ideally as you say one should just be able to use real-world pilot training materials, navigational charts and aircraft checklists (for B737, for example, there is an unofficial iOS checklist app). Then all that’s left is documentation of sim’s limitations—a good sim should tell you in what aspects it fails to simulate the real world.
It’s actually really rewarding to be able to figure out (mostly) on your own how to complete an IFR flight, given just the charts and the 6 basic analog instruments.
(Same here, X-Plane and no MSFS—as far as I heard, the 2020 version is still outdated as far as simulation of the actual physics of flight is concerned and seems to not have changed much from FSX days.)
The Boeing 777 [1] and 787 [2] have an integrated Electronic Checklist screen. Any decent simulation of these aircraft will have that; I know PMDG's 777 [3] does.
However, the flip side is that the simulation is generally realistic enough that you can use instructional materials for real world piloting. The VOR frequencies match the real world, the real SIDs and STARs are in the simulated Garmin GPS, etc.
Not sure how much this holds for FS2020.