>> So you're saying that judge will ignore the separate profiles but it'll magically stop from depositioning all your phones that might contain work conversations?

Yes.

Source: Been subpoenaed three times and my attorneys have had restrictions placed on what can/cannot be searched... like I am assuming most competent attorneys can provide. The party has to have reasonable indication that relevant data is on personal devices so the opposing counsel doesn't go goldfishing through a bunch of stuff to turn up potentially unrelated dirt in discovery.