So you believe they only slowed down your phone to have you buy a new phone and hoped not to get caught?
My GF and I were affected by the voltage issue on iPhone 6 & 6S. If Apple can fix it by limiting voltage, it will give a better experience. Alternative is literal data loss which I consider much worse. BUT: They do need to tell users about this slow down. This is where they made a mistake.
I don't see them reverting this change. I do see them paying a hefty fine for covertly downgrading, and being forced to inform their users of the downgrade. I do see them pushing software updates to refine the "battery management system" going forward.