This is a good point that can't be expressed deeply enough. The gm needs things that players don't & might not even be happy about but having it in a gm focused book means that it's less abhorrent. Of course that depends on if wotc are actually going to change much in the style beyond how many front & back covers there are.Presumably the plan is for the player-facing content to subsidize the content of the other two, since it's difficult to produce DM-facing content and really sell a lot of books. It's probably more correct to say that we'd never get anything like this if it wasn't structured this way. The amount of work to create the DM content is so high that it requires the player content to justify, and the player content doesn't have a meaningful reason to exist without the DM content.