I don't clutter my phone with every single airline's app, electronic boarding passes often don't list the gate and never reflect status changes, and I don't get text updates when I'm traveling for work because our corporate booking system helpfully hard-codes my office phone in the contact information.

Besides, even when the stars line up and my phone really does reliably give me updates on the flight status, digging it out of my pocket, unlocking it, etc is more hassle than glancing at a status board as I walk past.