Well - some of us travel more than half the time. I'm often away from home and need to pay bills, buy/sell investments, read and respond to e-mail, buy parts or tools on line, or book a quick flight, or rental car, or hotel. Often those things need to be done that day, and can't wait until I am at a hotel that night with a computer. Often, I don't even bring a computer with me.
There are times when booking a flight, or rental car, in the next ten minutes is the difference between getting home that day, or waiting until the next.
My phone is protected via fingerprint, which is more secure than passcode. Yes, via fingerprint ID, I can log in to Schwab, Vanguard, T. Rowe Price, three different banks, my insurance company, e-mail, and a dozen hotel/car/airline apps. The phone is backed up and if it gets lost or stolen, will brick itself after ten failed password entries. I don't worry about security because the fingerprint is so fast, and so much more secure than a password.
It's incredibly powerful and fast and I can do everything I need, right when I need it. I will upgrade to a 5G device soon, just to have the speed.
For most tasks, I prefer my laptop, too, but it's not cellular, and it doesn't fit in a jacket pocket.