Sean,
Other than Masters week, it's members and their guests.Oct-May
There are only members tees and back tees-with a vast difference in between.
I know many of their senior members (the majority) struggle as their drives crash into upslopes or don't reach the downslopes so important to play well at ANGC.
Given that winter is their season, the damp cold weather and winter conditions of Augusta would make the back tees prohibitively long for low handicappers and club pros (or even Tour pros). The firm fast (and usually warm)conditions we see during April are not the norm in December, January, or February.
So the scratch player has to choose between 6300 yards or 7500-a choice many low handicappers are used to making.
I think these are referred to as high class problems.
As you say it's a purpose driven course (The Masters)so altering the course for pros makes perfect sense.
Given the ineptitude of the governing bodies, the added distance at ANGC makes sense and other than #7 has properly restored the "shot" values.This is of course doable because ANGC has the width to support the lengthening. The course was once known as being very long, but the Augusta many remember had already become somewhat obsolete (distancewise) by the mid 90's. Tiger pushed it over the edge and the Pro V1 sealed the deal. The large amount of "roars" everybody remembers were in part due to the minor lengthening not quite keeping up with the ball in the 90's.They did another 2 rounds of lengthening in the early 2000's. )2002 I believe) Then a few years of cold,bad weather made it seem like they had over corrected-most famously when Zach won laying up)
I do disagree with the ever increasing green speeds as they have been slowly taking the pitch out of the greens in pinnable areas(flatter tiers vs overall slope) to allow the ball to stop somewhere near the pin.This changes the difference between a severe uphill putt and a severe downhill putt, making judgement easier-not harder.(to say nothing of its detrimemntal effect on the world's wanna be policy makers for their clubs)
It also has the side effect of making the greens borderline unputtable in winds such as they had this weekend-which while strong for Augusta, weren't really that strong at all compared to how the wind blows on the links or even here on Long island.