It's not just RAM that's the issue with the Air. It's the GPU, too. It has the same GPU as the iPhone 5s (1136*640=727,040 pixels) while powering a 2048*1536 (3,145,728) pixel display. Note, all other retina iPads have X version chipsets with beefed up graphics albeit the A5X still didn't have the oomph to power the retina display. Come to think of it, it was graphics performance and not CPU that's the biggest failing on the iPad 3, too. Iirc, it was 2x GPU performance improvement vs iPad 2 for 4x the number of pixels.Yeah I know. I just think it's being crippled a little too fast. How's the Air 1 on iOS 11? I have read here that it wasn't all too well compared to older versions and other iPads. It supports it and removes features, only to still have performance decrease anyway.
No other iPad - correct me if I'm wrong - had 2GB of RAM when the Air 1 was launched; yet, the 12.9 Pro was precedent for 4GB. Apple still skimped on RAM. For people who update their iPads regardless of performance drop statements by other people, it doesn't look all too well for iOS 12 or 13.
That said, iirc iPad Air on iOS 11 is still faster than iPad 2/3 on iOS 8-9. iPad Air on iOS 11 is definitely sluggish but it's not quite as painfully slow like the iPad 2/3 on iOS 8-9 were.
Apple always skimps on RAM. I'm actually more surprised when they bump up the RAM. I expect 4GB wasn't because Apple was feeling generous but because it was necessary for the 12.9's 2732*2048 (5,595,136) pixel display.
Having used iOS (or iPhone OS) since the original iPhone (2007) and having seen its progression, nope, I don't think the Pro 9.7 is being crippled too fast. Besides, the limitation in this case isn't really all that useful on the 2016 Pro 9.7's smaller display. There were more nonsensical limitations on features for previous products. At least this one's understandable.
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We have the Air 2, Pro 9.7, 2017 iPad (A9) and 2nd gen Pro 12.9 in our household and honestly, there's no significant difference among them for general usage (web browsing, email, video streaming, etc) despite the A10X's 3900 GB4 single-core and 9300 GB4 multi-core scores.https://www.imore.com/ipad-6#geekbench
~3250/5850
Still not a ginormous improvement over the 1830/4450 of the iPad Air 2, at least for multi-core. It's about 1/3rd faster multi-core.
I reckon past the A8X/A9, performance increases are just gravy for basic use and really more helpful for those who run resource-hungry apps. Kinda like how, say, a Core 2 Duo E8400 (circa 2008?) paired with at least 4GB RAM and SSD still works quite well for general tasks even now. Incidentally, GB4 single-core for E8400 is ~1800 similar to the A8X.