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Small selection bias. You can't get any meaningful information from that small and that non random of a sample. The author seems to have made his conclusions ahead of time and then performed something that has the basic appearance of an experiment which backed up what he had already concluded...
The DM gave a player a point of inspiration for playing according to the character's flaw, which that player can spend to gain Advantage on a roll.
EDIT: As was just said. :)
Just to add to this, there was also the phenomena of statting up these heroes to be more powerful than than were allowed by the rules in every edition they were statted (Elminster's again the most egregious example of this.) So not only are these characters more powerful than you, but they...
I've been wanting the same thing. I stumbled across this podcast which is part one of three on the subject. Part 2 has an example in play. I haven't listened to all of it yet, but the other advice on that website is pretty solid.
Plus TSR/Wizards have tried to reboot Gamma World a bazillion times and it hasn't taken ever. (I remember wandering by Jeff Easley and Larry Elmore at a Gen Con years ago and they were giggling over TSR's latest attempt at it.) So adding the collectible aspect to this newest attempt both...
Interestingly enough, the events in Savage Tide are treated as canon in Demonomicon, having occurred 100 years or so ago. It has Demogorgon getting killed and replaced by a PC. He got better. :)
It's things like this that make me so thankful that I got into this hobby in the first place. Sure it's fun to roll a 20 when you're pretending to fight a dragon and what not, but the joy of taking random that happens in a game and spontaneously running wild with it can't be measured. :)
I'm reading Steven Erickson's Malazan Books of the Fallen currently, which definitely qualify for what you're after. The protagonists are essentially high level PCs and the Mages cast spells accordingly.