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I have this issue from time to time, so I'd welcome ability to turn the icon off. I find the only time I use dictation for texts is in the car, via CarPlay. Generally, I don't like everyone around me hearing everything I want to send to someone.

My bigger frustration is that I can never type as fast as I want to on the iOS keyboard, or else it makes loads of mistakes. If I slow down, it stops with all the typing "p" when I pressed "o" and auto-correcting words incorrectly.
 
The period button and the waste of space at the bottom are extremely poor decisions. Sooo Apple… I tried an Android the other day and the amount of keyboard customization, also super easy, made me feel that my iPhone is a 90s car: electric windows, a/c, stereo…. But nothing “new”. Just “basic nice”,
 
Have never accidentally pressed the button. Also I don't use it frequently and so good that there is an option to move it.
 
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