Thats where you making a mistake... there is no point in braking late into a bend. Once the front end loses grip the power is sent to the back to correct the understeer. I doubt any good driver induces understeer whilst braking.... Infact if you are then your simply braking too late.
Do you understand the term 'trail braking'?
Braking so hard and late (to the apex) you force the back to swing out?
After nearly 20 years of trackdays, Sprints and Hillclimbs, I can assure you braking right to the point of locking up inducing understeer is not braking too late, or making a mistake...it's getting a car into a corner as fast as you can, so you can get on the power hard with the minimum of lock on.
So there is a point in braking late into a bend...but for this perfectly valid technique to work, you need the front not to plough on...which means it's not ideal with a damn great boat anchor in the front...which is why I don't like VR6s and their understeer...because you can't trail brake them easily.
Of course, driving like that can only be done if you have enough mechnical grip to pull you through the corner...where the Haldex based 4WD system again fails...as it is likely to have you ploughing off under power.
It's also easy to over-cook the braking and slide off...where having a heavy engine counts against you (again).
Understeer is usually caused by the front tyres pushing wide when struggling for grip under acceleration... Thats what the R32 does not suffer from. As a dead weight then you are correct, the heavier car will always carry its weight forwards under braking.
That's power understeer...
Different to plain old nose weight induced understeer....which any V6 will do more than a 4 cylinder. That's physics..enothing to do with driving style..