Support for 32-bit has ended. The newest 32-bit device was released in 2013. Sorry, but supporting devices that are over 4 years old just doesn't make sense.
Apple supports their devices FAR LONGER than the industry average. If you're concerned, it might be time to consider upgrading to something a bit newer.
You'll probably also nod your shoulders if a car company fails to make a steering or breaking function reliable. Whether that turns out on day 1 or after 10 years - it is just plain unacceptable and the car will be called back.
I don't see your reasoning as to why Apple shouldn't take measures across the line.
Because they don't have the budgets to support their legacy ? Well, they own continents by now and keep memorizing that legacy as long and as often as it suits them well.
Because this technology is so old that the engineers are pensioned by now ?
Well, 30 year old tech should have been documented and kept alive anyway - in particular if it still is part of their OS codebase.
Because it's too costly to send multi- gigabytes over the Internet ?
Well, Apple could have devised elegant small 10 K patches instead of sending multigig packages around for every single bug, function, new set of (poo)mojies.
Because it is just too much work ?
Well, this is bug so elementary that it is probably in the shared codebase where it could be patched in 1 fell swoop.
Because Eddy Cue is too busy contracting content providers ?
Well, I would keep him so - far from the crown jewels (remaining) and anything that has to do with reputation - anyway.
Patches should be done across the (former) product line where necessary.
This is not a subject for lamentation, appeasement or waning.
Let alone your irrelevant guesses about the "industry average" (that mediocrity Apple already compares itself too often now)