This is spot on! And point to one of bigger problems I see with people that spend so much time "doing chi sao" to the point where they no longer know or can see the differences you're talking about.
On a semi-related note (and I'm sure I'll catch heat on this from some people here
):
Imo, all of the squared-up 2-hand connected tan/bong/fook "Chi Saoing" we see is a very specific range and facing and would be a very short timeframe in an actual fight (I'm talking a split second or two at most) - that is, IF it even occurs at all.
Most of the clips showing 2 guys going at it chi saoing for sometimes a minute or two straight is really 180 degrees from what WC should be. I never could wrap my head around it. If one of the guys were to throw just one real punch during any of it, most of the chi sao looping shown would halt almost immediately. And not saying the people in the clips don't have the skills to defend agaisnt a punch (they very well may), but there's no real proof if you jsut watch the clips. And I'm talking more specifically about all the T/B/F and Bong/Laap/Push chis sao looping mega-battles to gladiator music that carry on for sometimes minutes at a time. Fights just don't happen like that.