I see the points being made and they are valid, but there is another thing to consider.
Guys who send their frames away to get worked on by whatever company, for this example ill use agency arms because their frames most closely mimic the P80 frames feature wise. You will spend 79 bucks on a Glock frame or however much you spent on your gun when you bought it and send it to agency, then 8-10 weeks and $400 later you'll have a frame with the same features as a $120-$150 P80 frame. Now if you don't want stippling, accelerator cuts or double undercuts than a factory frame is good for you.
Another thing that comes up is the reliability of the P80 frames. I bought on of the first 50 PF940C (Glock 19) released in California. Using a hand drill, Gerber multitool and a pack of hand files I made a working handgun. To date put approximately 3,800 rds of 9mm through my gun with no mechanical failures or malfunctions. I have had a few operator caused malfunctions but those are not the frames fault. I have built 3 frames to date and for best reliability I have always used Glock OEM parts, lone wolf parts are 50/50 as far as reliability goes.
Legality wise in Dade county FL where I am currently located, to my knowledge there is no legal repercussions for carrying or using a P80 or other 80% frames. FL does just limit you to building 1 per year.
I really enjoy the P80 Glock style frames and everyone who has touched mine has enjoyed it and then bought one.