Thanks for the info.
When you say 'fence' are you meaning like Geoff Thompson fence's, something like this (attached)?
For me, this would be like a modified Man Sau Wu position. Differences, but enough similarities to make it Wing Tsun applicable (meaning it would fit with what we would want/try to do from offence or defence).
Why wait until you get clipped to use a guard when you can already be in that guard and throwing shots out of it?
Yes, it makes some sense. Personally, I think with Wing Tsun we wouldn't want to be throwing shots (from range, rather than close) if our hands are up by our heads, as many of our strikes come from the elbow being in and our arms more in front of the body (as opposed to elbows tucked in, but by the side of the body, and hands by the side of the face).
For me when I fight its about mimimalising space that my opponent can hit me, so I keep my elbows in, my chin tucked, my hands close and high.
I think we're looking to minimise space too, but more the space in front - so maybe this is a conceptual different between Wing Chun/Wing Tsun and the arts you study? Edit: To add, I think this attached photo is a good example of minimising space - and similar in that respect to Man/Wu.