While I see the appeal of not having a mobile phone, I'd say that if you never had a smart-phone, you could give it a try before you say it's a bloated cost. It can actually improve your life in many ways and on my side it's definitely worth the cost even if I don't call anyone that often. I'd be even glad to own a smart-... thing. It doesn't have to have a phone function.
I do appreciate having a map with me, being able to transfer money wherever I am, take a photo without carrying a full camera, read a book on a plane without adding the weight to the luggage, have some music available when I'm bored, not having to print tickets when possible, having all my notes/calendar without carrying an actual notebook, and a number of other things that simply improve my life without any downsides.
No phone an a Wifi-only iPad might be a good choice for your first paragraph (assuming you have reliable wireless at your home), although the size would hinder mobility a decent bit.
I do appreciate having a map with me, being able to transfer money wherever I am, take a photo without carrying a full camera, read a book on a plane without adding the weight to the luggage, have some music available when I'm bored, not having to print tickets when possible, having all my notes/calendar without carrying an actual notebook, and a number of other things that simply improve my life without any downsides.