I have additional information about this issue:
I kept the oldest allowable OS on my Iphone SE for years, but accidentally updated it recently. I listen to a lot of music using a JVC headphone set with a mic and "clicker" interface. Until the OS update, I could click once and play what I was listening to last, or at least play randomly from my itunes music. After the OS update, if I click once to pause the music, then wait some tens of seconds, a subsequent click opens the "voice control" feature instead of restarting the music. This is especially frustrating when I am engaged in some activity and my phone decides that I would like to facetime a contact whom I haven't spoken with in over a decade.
No amount of feature de-activation has abated this flaw, and in my experience it adds to the compounding evidence of apple's perpetual, monotonic decline from a meticulously crafted beacon of human-machine interface elegance to a despotic band of ignorant, out-of-touch designers who have inherited an unearned amount of public trust. Maybe that's what happens when you think hardware design elegance is the same thing as HMI design elegance, Jony Ive.