I've always assumed that, at some point, I must have fumbled and pressed "set as default" one time when it asked me. I regularly drop my phone, and fumbles that

I've always assumed that, at some point, I must have fumbled and pressed "set as default" one time when it asked me. I regularly drop my phone, and fumbles that get me into settings I don't want happen occasionally. But it definitely used to ask me every time.