I just don't get what you are on about. Looking at the back or the underside of a workpiece "in any orientations" is easily achieved just by turning the thing over and looking at it.
You can turn over the worked side of the timber all you want, but you won't get the idea if the surface isn't flat and you won't look with the lamp.
As far as I'm concerned, not doing such is pretending to be a CNC machine with a DRO.
I don't think I'm better than my flattish bench, though I could make it flatter if I wished with more shimmed chocks, it's not what I mean.
and when I see the opposite of this regarding the work,
I see it as someone fighting flatness, and it's akin to perhaps someone boxing Floyd Mayweather,
as in a lot of swipes and effort with no result with said swipes,
well that of whom are honest workers.
My comment was regarding that Charlesworth had much emphasis on the edges,
by that I mean perimeter,
His methodology is totally respecting this, and goes hand in hand with sensible work also,
and is the obvious follow on once one has watched the jack plane work from others, that is who
is honest and can get pretty close, which is enough for some folks standards.
i.e
Not deforming the work with clamping, especially thinner stuff.
(I had presumed the OP had made his panels thinner, hence my warning)
The use of having a flat surface for working thin stock.
Planing in rows, and not crossgrain planing destroying this valuable perimeter for ones
bench, or winding sticks to rest on.
Checking things can be sped up by the use of the bench instead, as one can see both length and width in one.
Tom