Side folding AR stock on a Mossberg Cruiser over here. Have practiced with it in PGO configuration. I honestly don't understand the whole PGO debate.
I store the weapon with the stock folded for space reasons. I practiced with the stock folded in case I had to use it without time or space to unfold the stock.
The statement that you can never fire a PGO comfortably, or hit what you're pointing it at is completely untrue. Now, I said pointing, not aiming. I hold it close to myself at chest level, where the arms naturally tighten up, index myself towards the target and fire. In my experience, getting hits out to 20 feet came pretty naturally to me, but that's just me, YMMV. In any case I can't imagine being able to hit targets at that distance being DIFFICULT for anyone if they use the method I described. Further than that takes some practice.
Lasers help, but aren't necessary, and they are expensive. In general, good lasers aren't cheap, and cheap lasers aren't any good, especially when you're talking about 12 gauge recoil. On a shotgun, a cheap laser can either come off the gun entirely, lose its zero (granted, not a HUGE issue with a shotgun), or just shut off and stop working.
Of course, it's also true that a PGO is never going to outperform a full stocked shotgun. There's no reason to even discuss that point further. As a rule of thumb I do not recommend pistol grip only shotguns to anyone who asks for my advice on weapons. If storage space is a factor, there are quality folding stocks on the market. If the folding stock STILL makes the shotgun too bulky? Well, then I'd say you have some very specific needs from your weapon, and a PGO MAY just fit those needs, but we're talking about some very specific conditions.