Yes Gordon safety margin for sure especially on a sharp LE wing Taylorcraft that's prone to an abrupt loss of lift and nose down stall.
For my Cubs and 12 the benefit was mainly on floats and somewhat skis in deep snow. In any wind the float planes with power would fly directly from plowing mode to takeoff (in the 30's mph GPS) via wave bounce and prop blast on the flapped portion of the inboard wing with little planing and then maintain flight just above the water while speed built. On landing I could touch the rear of the floats easy (same 30's mph with power) then plop down in a very short arrival. The 12 had a Crosswinds cuff and I never added VG's but now wished I had retained it and put them on. The cuff without VG's stalled like the Taylorcraft when it was pushed at altitude and was all done flying, the stock wing not as much. On normal landing (less than ~15*) it never let go unexpectedly.
Gary
As a past T-Craft flier, I still find any comments on it's flight characteristics interesting. Mine didn't have VG's though, and I didn't do any off airport with it. It wasn't until I bought my first RANS S-7 25 years ago that I got interested in all that, and I started noticing Micro's ads for certified aircraft VG's. I remember Chuck White referencing Jerry Burr when we talked about where to put them on my 7, ( the same as on a Champ it turned out, wing and the hor stab) and after 3 different placements (with double sided tape) I settled on the first, which is quite far forward. I set my second 7 up the exact same way, if it was good enough for Jerry Burr, it's good enough for me! It's when landing steeper slopes that I get my slowest landing, the slope kinda matching the high AOA on touchdown.
I can safely venture much closer to the "all done flying, ain't no more" area on landings and even low level maneuvering, and often do. BUT, when I really push it right to the edge, it can bite. Like a friendly dog, friendly, right up until it snaps at you! But it is nothing I worry about doing accidental, as the stick pressure and AOA gives me plenty of warning, in fact I have played with it, at 6" height.....just to get more familiar with it. I like to keep some power in on very short landings, and the vg;s placement seems to really help this be safe and keep it flying.
On this recent video Jonas shot (he of landing in the snow on tires/getting stuck fame/infamy, his idea, don't drag me into his decision making process) I finally got visual affirmation of how slow I can land the thing when it all comes together, damn slow. Upslope, about 6500' about 35-40 degrees, no wind. Cut to the good part= 10:32 in.
https://www.youtube.com/watch?v=nmTK-fdqe_M&t=16s