Keep in mind this is relatively new. The press seems to be spinning it as an "ah ha, old phones really are getting slower!" Well, yes, now. I mean as of 10.2.1, so a year ago, but people have been thinking their phones were getting slower since smartphones became a thing.
Likewise with old computers.
And as someone else commented, "apple will never add a MAKE MY PHONE UNSTABLE switch."
Likewise with old computers.
And as someone else commented, "apple will never add a MAKE MY PHONE UNSTABLE switch."