Well to this day I use Audiobus, Auria, Cubasic, et. al. on the old iPad 3, iOS 9, no problems, except the slowness introduced since iOS 8. I think Safari and Angry Birds will continue to run a-ok.
There is no future-proofing of mobile devices. As iOS continues to expand and use new features, as more power-efficient and bigger batteries are introduced to the mix... as better performance processors continue to be unveiled, iOS will continue to become a headache for old devices, as every version that comes out is optimised for current hardware, whether optimised means really optimised or simply "runs better -wink wink-".
I'm not justifying overpriced apple hardware or their marketing, aggressive profit, strategies, just saying that this whole 4GB debate has gotten way out of proportion.
Reminds me of the old megapixel wars (still going, but largely forgotten in favor of other holy wars) where the dummies thought more megapixels means "better".
Like others mentioned, it's also not only about RAM but also the CPU and other components. If it was that easy then we could just double the RAM on that old Mac or PC and voila, instant speed boost.
Now the "pro" is on the same level as the 18 month old Air2
While I'm not a big fan of benchmarks, because they usually portrait ideal scenarios, I fail to see
how the A8X is on par with the A9X or the
GXA6850 is on par with the 7XT or
LPDDR3 is on par with LPDDR4.
It's not groundbreaking, it's not a game changer, it won't split history in two, but the new Pro is not simply a rebranded Air 2 which sells for way more (and I didn't even mention the pencil, smart connector, 4 speakers, improved rear camera or 4k video).
As an owner of a 12.9 ipp it makes me happy to know that the configuration of my device will be powerful enough for a very long time whereas that is not necessarily so (at least not as long) if I would have waited for the 9.7.
As an owner of a 12.9 IPP it makes you happy that you are drinking the whole Kool-aid of "4 GB RAM = Will last till 2022 no problems, 2 GB RAM = Will last 2 months tops".
Maybe try to read a little bit more to understand why RAM is not the only variable of the equation and why on september 2016 both IPP will be "obsolete" and hopefully by iOS 12 on 2018 is when they'll start to show their age and not before.