He's still fresh at being a Dm. So that's how he's progressed from where he started to now. I've noticed he's become more power hungry. Making it so that we don't get magic items because their to O.P. (his words) but yet the creatures we fight are honestly way to strong for us. We didn't have a chance against the beholder we fought. My character died. Two turned to stone. And the other was paralyzed. And he had it set up to where we couldn't get out of the 150ft cone so that we couldn't use magic ( half our party is magical users).
This is the alarming part, to me. The book thing seems like just a symptom of this DM's need to "win."
DMs like this typically won't offer their players anything they consider an "edge." I wouldn't be surprised if this DM, given XGtE as a gift, said, "can't use until I've had a chance to read it over," then "can't use until the next campaign," then "everything in here is banninated." And then blames the players for "making me take this step because of all the badgering."
The deeper problem isn't the source material being allowed for PC creation, it's the DM's attitude toward the players. This DM may be too new to realize that the player characters are basically supposed to win. Not overwhelmingly, not every time, not without the potential for setbacks along the way, not necessarily with ease, but more often than not. And that the game is supposed to be fun for everyone who's playing, not just the DM.
In my view, this DM needs rehabilitation more than a new book. JMHO. HTH. HAND.
I was questioning both. He made it sound like the beholder was not only above their pay grade but in a room that pinned them all down in front of its big eye. So while, yes, retreat is always an option, it sounded like it wasn't an option here.
The beholder also went first in combat which at the beginning had my character pinned to a wall and two others petrified. There wasn't really a chance of retreat. On my turn I failed the save. Then got death rayed, and died. The other two got turned to stone.