Maybe SRAM are quietly admitting that most people are terrible at keeping to scheduled service intervals and are playing a bit safe? I think Shimano should have clear bladders and reservoir caps so that riders can bleed their brakes before the fluid goes jet black and blocks the lever ;)
I can't help think that the whole 'having less oil in the lowers to keep weight down' is a bit of an old wives / husbands / common-law partners tale. The correct amount in all RS 35mm forks is 10ml in each leg (maybe there's an exception) which weighs pretty well nothing. More likely to be a installation / QC error if that happens IMHO.