The iPhone 6s (and 4S and 8 plus) are iPhone Versions that will stand the rest of time.
iPhone 6s double the ram
iPhone 4s introduced duo core
iPhone 8 Plus A11 processor was significantly faster than A10 plus 3GB ram (yeah I know iPhone 7 Plus had 3GB ram also) but the A11 processor is a beast
people got 5 years easy of use out of the 4s and now 6s.
The 8 plus will be the same way.
iPhone 6s double the ram
iPhone 4s introduced duo core
iPhone 8 Plus A11 processor was significantly faster than A10 plus 3GB ram (yeah I know iPhone 7 Plus had 3GB ram also) but the A11 processor is a beast
people got 5 years easy of use out of the 4s and now 6s.
The 8 plus will be the same way.