Yes, I've seen this doc already (will try to read through it again). But what I meant is something else, let me express my point in more detail.
Surely as an end user I need the target curve to be customisable. We still have a lot of recordings that was recorded in unknown conditions, at times when there was no such powerful equalisation, recordings are often mixed in a rooms with excess bass energy, our speakers are different, different directivity, not so ideal room, etc., so, we need to 'recreate' or compensate for this in our rooms. But for mastering... especially if we are talking about multichannel systems supposed to be in a well damped room... the differences from the speakers also will be minimal, assuming they are good speakers of course, and for the recording studio - they should be good. I hope So, the end result in such conditions is pretty much dependent on how the system is equalised, more precisely - the target. And we will newer know what it was, how to recreate exact conditions where the old recording was made without following any standard, so there should be a standard to start with, and the only sensible one, so it can be re-targeted again - is the flat mapping from voltage to sound pressure. Any other standard would be as good... but will be lost and forgotten soon in the universe of equally good ones. If everyone needs to apply some 'universal' target curve, like a 'boost bass a little' then it means the mixing was done... not very well. And if you are equalising the recording studio... do it with a sensible starting point.
