I'm confused, how easy do they think it is to answer the phone, and then use the phone simultaneously for a call while opening their app and (presumably) authen

I'm confused, how easy do they think it is to answer the phone, and then use the phone simultaneously for a call while opening their app and (presumably) authenticating with the app in order to get this information? I can barely handle adding a calendar event while on a call without accidentally hanging up or something, what a weird UI. Why do they not just contact you via their installed app if they're going to assume you have it installed...