I must admit I didn't read much of this thread. I no longer play tourneys and don't really give a crap about handicaps. Yet, two things struck me that I've always wondered about. Before getting to those, when I did play tournaments back when I was learning the game, sandbagging seemed to be less of an issue as my HC went down and I played with better players. I was never any good, but when I escaped the the high double-digit HC range and went to a 10 or so or below, there seemed to be less baggers.
I play in the USGA domain. Many years ago, I used to play in a match play competition. The guy that ran this event said that some USA golfers from around here went to play in Ireland and were taught there how to play match play. He said that Irish guys told them that the proper way to handicap a match was to have the low capper play scratch and give the higher player 66-75% of the difference between caps (whichever makes the math easier) to the higher capper. This is match play only, and all I ever play these days. The assumption is that you can't give full HC in match play. Well, this made sense to me and for the next 20 years or so this is how we handicapped matches and they came out remarkably even. We even did yearly match play tournaments based on this formula. That worked out fine. The higher handicaps and sandbaggers complained of course that they weren't getting their full strokes, but they quickly shut up when we pointed out that they were getting their shots on the hardest holes while the better player was not, whatever his/her HC. It worked.
Then I went to Ireland and played some matches. The golfers I met there had never heard this system. I'd have matches with better players and they'd give me the full difference between our handicaps and I'd always win (extremely small sample). I'd tell them before the match that you can't give full HC in match play. They'd say it's fair. It was match play, so if I was out of the hole making a jumbo, I lost. But if I was making pars on my stroke holes, I was hard to beat. I could never figure this out. For 20+ years we'd be using this "Irish" system that worked to perfection. Everyone won or lost in almost perfect balance to how well they played. Somebody, please, explain this to me.
The other thing that bothers me about such discussions is that low scores do happen. It's happened to me when I was just learning the game. I was just learning, earnest in posting scores, establishing a HC, playing by the rules, and all that. Some guy invites me to a member-guest at another club when I was playing poorly. I don't remember, but I suppose I was about an 18 cap at the time. The guy who invited me was a fairly good single-digit capper, say a 7. I was a hack. That week before I went out on the range to practice and found something that seemed to work. I played the event and shot 3 over and 4 over on my own ball (best ball) that weekend while my partner ham-and-egged when I didn't. We weren't cheats, it just happened. It was embarrassing, but it happens. It doesn't seem like I won the lottery. I was trying to play well and I did. There's a difference that statistics don't cover.