Yep, excellent post. A few of us have been trying to say this for a while, but ultimately some of those who it would benefit most often get the most annoyed.
This is where I'm also going to come back to @Jack Joyce
Going into FM25 i think we need a glossary of FM terms, because as mentioned some of ways FM measures some statistics (Like OPPDA) aren't the same as real life, which makes sense as its not exactly real life. But it does mean that context needs explaining more.
Also think a few footballing concepts are definitely worth putting in there, like a chapter on Positional Play, and a chapter on Rest Defence, as the two go hand in hand, and as game evolves, understanding transitions will be more and more important. Almost like a bible. I dont think it should be play by play or hand holding, rather footballing concepts as delivered by FM.
Maybe one to pick your brain on in another forum, but (and this is based on what i see in GD and the tactics forum only, so this might be a narrow collection of view points) i dont think enough players either grasp, or have enough footballing knowledge, or perhaps some do, but they cant easily translate what they know about football to FM. Updating the manual and adding more holistic insights might be a great way to bridge it