Well, as for ammo, the fact that they suggest players find way more gold than they can use, thus making it a simple matter to carry around as much ammo as physically possible sort of trivializes it, in my eyes.
Plus, I stopped caring about it back in 4e as a DM. If a Wizard can throw fire from his hands all day long, then tracking ammo for a Ranger is a nerf to the Ranger, IMO. I just tell players that if they cough up a few gold pieces anytime they hit town to replenish ammo and "spell components", I'm fine with assuming they can scavenge this stuff in the field sufficient to not need to track it.