For landlines I think it comes down to some other factors, too.
One is if you have to have a fax. (yes, some people still use those) We need a fax for our home office.
The other thing is, we get really crappy cell reception at our house. I have to run out on the deck to answer a call or it goes straight to voice mail.

The whole "always connected" argument? No one forces it on you. These things do have an off or silent button. They are not attached by a permanent leash to your body. We have a simple agreement at our house. No phones at meals, period, land or cell.No cell phones at a table, ever. We went out to dinner at a super nice $$ place we like. There was a couple at another table, that both were diddling with their phones the whole time. They want to live like that fine, I think I left mine in the car.