The A10 Fusion increased CPU and GPU by 40% and 50% compared to the A9 which in itself isn’t that great compared to the usual double increases we see from S models. But the A11 Bionic took an even smaller step at 25% and 30%. Is there any reason at all to even go with the iPhone 8 if you don’t care about wireless charging? It seems the iPhone 7 gives more bang for the buck (especially if you can get a used one with Apple Care off Craigslist or eBay at 2/3 the price of an 8).
Mate, I don't think you appreciate just how powerful these chips are or what those numbers mean....the A11 is an absolute beast of a chip.
Even the A9 is quite capable today, no app to date really stresses it. Not even high performance games or 4k video editing apps. The A9 can handle it all well.
The A11 is remarkable, and powerful on a whole other level from the A10 - the A10 can't even use all 4 cores together.
PS the iPhone 5 and it's A6 is still fine on iOS 10 for using the phone as a smartphone. In fact, it's more than enough power for any basic functionality.