Okay, this thread should get juicy.
No lag pressure? I'm not a fan of the description, but there is pressure on the shaft (going back and coming down) as there is pressure on the keys to type this note. Call it whatever.
Flat left wrist? I don't really like that description either (as the orientation of the wrist can be many ways based on grip selection), but there is a common thread with people that apply "pressure" better than others. At impact, there is a straightish or bowed (club still seeking straight) combination of the shaft and left arm common to better strikers.
Straight Plane Line? I have been enlighted and educated a great deal thanks to BM's site. Now I feel I know what a straight plane line really is!
I can sure attest, as a player, that once I understood (or thought I did) the "three imperitives," I enhanced my skills as a player.
Lag pressure thoughts gave me better rythym.
Flat left wrist (leverage) gave me more consistent distance control and the ability to flight the ball as needed.
The combination of the two above where "UGE."
Straight plane line tought me the shape of the swing and the "leftness" of the follow through.
Now prior to leaning all this stuff, I was a good player anyway. I got a scholarship at a D1 school. Got my Canadian Tour card and played a few Nationwide events. The problem back then, 120 years ago, even though I could play well for a stretch (sub 70's), I didn't understand my misses at all and got rattled when something crept in.
A TGM instructor was very helpful to eliminate some of the question marks. I still hit the odd Chef Special, but I'm not left bewilderd prior to some good TGM.
Where am I going? What the hell are we going to teach people if not for some basics that have to happen. I don't give a darn about methods or what a dude looks like, but..... "does the club work like a club" (to quote an Italian) and what language is best to help the chopper get the club working like a club.
Off to bed.
Cheers.