Well you know, because your view has a query that asks for a Person object with or without a phone number. The cache (your store) is managed by Apollo not yourself.
When you say this, I hear "Apollo and GraphQL are fragile technologies that don't play well with others."
Furthermore, technical decisions like which libraries to use are many times not at all related to technical reasons like this, but rather what a particular developer with influence wants to do, based on their own personal preferences. OR, the downsides of decisions to use certain technologies are often not understood until problems begin to creep up, and by then it's too late. Of course, technology companies, especially venture backed ones, don't want to highlight those things to decision makers. Either way, I have a hard time blaming the rank and file developers who probably had no input in the first place.