...Now, for LT to have returned to ideas that were there and then not there, it stands to reason that he must have learned from someone else who held those ideas, or YM thought him not intelligent or talented enough to learn his later ideas, and so taught him the old, common way. The latter, I find not so likely...
LFJ this is pure speculation. Just because WSL was taught a simpler, more fighting focused approach that you happen to like, doesn't mean that the other ideas were "there, then not there", or that GM yip didn't shift his emphasis towards softer, more yielding techniques in his later years.
All that we can know for certain is that during the decades GM Yip taught in Hong Kong he changed his teaching emphasis periodically and different students took away different approaches to the art. Some versions may be more appealing to you than others, but regardless of what certain individuals maintain, it's all Wing Chun.
People are free to pick and choose what they like, but judge each version on it's actual merits not on speculative stories. Goodness knows, we've heard enough of those already.