I myself prefer four and a half inch pocket... But you are correct. Most people just can't play on them. I think the op would have been much happier with the table if you would have got the League Cup pockets.The progression to tighter deeper pockets seems to correlate with the reduced popularity of pool.
I speculate we would see the same for basketball if the hoop kept getting higher and smaller as the decades pass.
While some want the continued challenge of tougher and tougher equipment, most people that play just want to have fun and enjoy the social interaction. Those are the people necessary to "grow pool" as so many here want to see.
But it's not too late. Maybe he can work out a trade with someone. Someone that wants his Pro Cut rails for League cut ones? I'm sure there's somebody out there. That would be a good question for one of the table mechanics on here.... As to what issues he would have making the swap.