While the logic is sensible, I believe that the phone is the least likely device to be affected.
That is, if you have an 12" iPad Pro, you're unlikely to also have a 12" MacBook, as they're devices of similar size and portability, and for "normal" people, also similar capability.
However, a phone is a different portability class. You have a phone with you at times where you do not bring an iPad. No amount of devices will help me when I do not have them with me. Even if I am at home, my phone is in my pocket, which an iPad, laptop or desktop never will be.
Therefore, I believe that the question is more about preference than about device overlap for phones.
But yes, you are right—anecdotes and opinions, rather than data.
That is, if you have an 12" iPad Pro, you're unlikely to also have a 12" MacBook, as they're devices of similar size and portability, and for "normal" people, also similar capability.
However, a phone is a different portability class. You have a phone with you at times where you do not bring an iPad. No amount of devices will help me when I do not have them with me. Even if I am at home, my phone is in my pocket, which an iPad, laptop or desktop never will be.
Therefore, I believe that the question is more about preference than about device overlap for phones.
But yes, you are right—anecdotes and opinions, rather than data.