I think XWind is spot on.
An instructor who refuse to see that in some cases a GO after V1 may be the only option, is not one I would like to have in the sim. Or the aircraft.
I’m happy with the V1 concept, I use it in the sim every time I’m there. We all do. It doesn’t mean we go outside the box every time we practise, but we refuse accept a «that can’t happen» attitude when we fly.
V1 is basically an engine failure speed, but over time other failures have been added. WS, Fire, etc. I do fly out of very limited runways in the winter time. A stop at V1 on a short, contaminated runway is very doubtful to be a success. An engine fire (listed as a stop both by Boeing and Airbus) with that engine still producing thrust, is a GO for me.
Landflap would stop and most likely end up in freezing seawater. Because that is what the book says. No exception. No thinking.