I just took up the book again to browse through it, and it took me only 20 minutes.
I guess I am not the target audience for this book. Though I also don't complain that the game "does not have rules for this". (Only that the rules for various things are anemic and every halfway decent GM should know better than the writers.)
The big issue I encounter is that when I read a page, I don't feel like I found any rules. Occasionally there are suggestions for alternative rules that you can use to replace rules in the PHB if you want, but nothing that seems like it's an actual mechanic of the default game.
Someone mentioned the assumptions for XP.
The assumptions stated by the book are that party can easily handle eight medium and hard encounters per day. As nearly everyone keeps saying, nobody seems to play that way. I certainly have no clue how I could cram that much combat into one day without the game turning into one giant bloodbath. And even if you follow that, it takes 13 days of such adventuring to get characters to 8th level. Which is frankly just absurd.
Switching to the rule to make short rests a night and long rest a week, it would turn into something like maybe a fight per day, and reaching 8th level in three or four months. Get in some more days without fights and you could maybe stretch it to a year. That still seems really hard to justify as sensible fiction.
From what I can tell, the rules for giving treasure are literally "whatever you feel like seems rewarding for the players."