I think people are interpreting parallel english differently. For me, I shift parallel, then adjust by feel for deflection. I call this parallel english. To me, this sounds like the same thing as using both FHE and BHE.
BTW, I experimented with using pure parallel with no adjustment, pure FHE and pure BHE. My end result was pure FHE was the best of the 3, but not as good as what I call parallel english with an adjustment.
All english requires some kind of adjustment. Some more than others.
My point in a previous post was when some people say they use parallel english, they believe they aim where they would with center and move to their english position. Even though many players perceive that and play really well, their movement isn't (and can't) be parallel regardless of what shaft is used.
Of course parallel english can work with alignment / sighting adjustments. Sometimes that adjustment is extreme -- sometimes not (depends on the shaft).
I've tried numerous shafts / techniques over the years and I find BHE to have the least amount of adjustment (by far) compared to LD shafts paired with other english methods. Now, a lot of that has to do with my shaft/bridge length.
So, BHE, FHE and Parallel (w/ alignment compensation) all work and some better than others. It all depends on the shaft used as well as bridging technique (distance, etc).
**** You can use a regular maple shaft with BHE and experience less (NET) deflection than a Predator if you master your BHE technique.