Well, OP, you've made up your mind.
I hope your room is ready the first time you wait in line at the front desk, because if it's not you will have to keep going back and waiting in that line again until it is. Everybody else will be able to look at their My Disney Experience account when they arrive at the hotel and may see their room number if their room is ready, letting them skip the front desk entirely. They can request a call or text with their room number if their room is not ready when they arrive.
If you are flying, I hope your flight isn't delayed because you won't know until you arrive at the airport. People with phones can request notifications. I hope your gate doesn't change because you won't know unless you keep sending someone over to the board on the wall to check. People with phones can request notifications and can keep checking their phones. I hope your flight isn't cancelled because everybody else will be able to use their phones to see what their options are. When it comes time to do online check in for your flight home, you will have to wait in line at Guest Relations or your hotel's front desk so that they can check in for you; people with phones can do that themselves.
You will have to wait in line at a Fastpass kiosk to make the 4th fastpass and keep going back to wait in line at a Fastpass kiosk each time you want further fastpasses for your group each day, and you will have to take what's available when you get to the front of the line. Everybody with a phone can make the 4th and further fastpass themselves and can keep refreshing to see if what they want becomes available.
You will have to wait in the regular line at quick service restaurants. People with phones can do mobile ordering so that their order is ready when they get to the restaurant.
If you want to make dining reservations while you are there, you will have to wait in line at Guest Relations. If you want to cancel a dining reservation while you are there, you will have to wait in line at Guest Relations; people with phones can do that at their convenience.
If you want to look at restaurant menus, you will have to either walk to the restaurant to look at the menu posted at the door, or wait in line at Guest Relations. People with phones can look at the menus online.
I assume everybody in your group who wants to take pictures has a digital camera, since nobody will be able to take pictures with their phones. Or maybe you have 35 mm cameras and plan to buy film and pay to have your pictures developed when you get home.
I assume you are using Magic Express to get to and from the airport, and Disney transportation while you are there. People with phones can request an Uber or Lyft or Minnie Van if they do not want to expend the time and wait in line for Disney transportation. Sometimes people plan to use Disney transportation, but someone doesn't feel well or some other unexpected problem comes up and they have flexibility. You are giving that up.
I hope everything goes as planned for you, because if anything goes wrong, you will not be able to problem-solve easily.