They will never do that, since it thwarts their ideas of planned obsolescence.This is what Apple needs to address the issue where someone can't downgrade after upgrading is too bad
I don't even think these upgrades that waste more battery are accidental. The truth is that nowadays people aren't paying what Apple asks for anything (and they always asked for a lot of money), specially in tablets, which aren't selling what they did in the first years:
http://fortune.com/2017/03/21/apple-ipad-decline/
The cheaper 2017 iPAD was another proof their sales weren't good.
It might seem a ridiculous idea to stay with the iOS your device comes with (in the case of iPAD Pro 10.5, 10.3.2), but that's the most logical thing a person can do, if it wants their device to last as much as possible.
I don't know why there's always a need to update iOS to the last version released, this has become a pathological behaviour, why can't these devices stick with a version and don't receive further improvements? I don't mean new fixes, I mean bloated changes that can only cause s.hit like this.
Worse, they had a lot of time to check what would happen with iOS 11, so there's no excuse.
They did it on purpose. Wasting more battery means replacing your device or battery sooner. In the end more profit for Apple.
If there's one thing users don't complain enough is battery. This link shows how much we can expect from tablets to last:
http://www.tabletpccomparison.net/battery-life/large-autonomy
And one thing that caught my attention is that the iPAD Air lasts 13.5 hours, the Mini 12.5, Mini 3/2 12h, and iPAD 4 11 hours. Then you have iPAD 2 with 10.5, and the rest with 10 hours (IPP 10.5, Air 2, etc.).
Why no one here discusses that all newer devices from Apple aren't improved in terms of battery? As long as they don't care about this or can't improve it without making the devices weigh a lot more I won't be updating iOS.