The graphs are like statistics - they can be used to prove anything.
Nobody's saying use the rear brake only - unless you're really crawling - but on a steep downhill you don't want to be using the front brake only either. It's too easy to end up vertical lol.
And there's a big difference between riding twisties on the track where your line is selected in advance and you can see where you're going and the surface is good, and riding between walls and hedges on loose surfaces and sharing the road with things and people that perhaps shouldn't really be there.
I've posted before about having a toolbox of techniques and using the ones most appropriate to the circumstances. My guess at what Tropicalbikey's particular circumstances are is that they need a lot more use of the rear brake than you might think.
Quick point - fitting new pads usually results in the expulsion of some excess fluid. Strictly speaking you'd expect the pistons to be pushed back a touch further than entirely necesary, expelling more fluid than strictly needs to be expelled and then requiring a slight top-up of no more than a few millilitres to put it back. Very often the top up doesn't get done at all, and when it does it isn't enough to have any effect on the general condition of the brake fluid. Don't expect the fluid to be changed when you have the pads changed.
Nothing you do on the street should boil the brake fluid, but any moisture in it will boil. The problem is a lot worse in a humid climate, where even topping up has to be done carefully to stop the fluid taking up atmospheric moisture.