The need of a smartphone is different from situation to situation.
If you need one in work that is one thing you can't get around unless you quit and get another job that dont require it.
Privately... When you are at home, its not really needed, its more of a nice/fun/lazy thing to have as a laptop/desktop can do the same as a smartphone can and even better.
No one will say that a 6" screen is better then a 15" to 24" screen is. No one will say a tiny touch screen keyboard is better then a real keyboard when writing emails, of forum posts in here and other places. Even typing a sms is nicer on a real keyboard.
When you are away from home.. is also a nice thing to have.. but it's more of a addiction and the fear of missing out on stuff online when you are away from home a few hours. Do you really-really-really need internet in your pocket going grocery shopping or going out to dinner with friends.. really?
I live in Sweden where almost everything is digitalized and with my dumbphone, credit card, and my computers i dont miss out on anything.
I used a smartphone for 2½ months when they shut down 2G/3G phone network and i had to wait for a delayed delivery on a new 4G dumbphone.
I really gave it a chance but every time i went online i hated the tiny 6,5" screen and that tiny keyboard, so i always put it aside after 2 minutes and used my 17" laptop instead.
I never found anything useful with that smartphone.. it felt like being back at the 90's again. I needed to start carry a shoulder/hand purse again to keep the phone in, as it didn't fit in a normal jacket pocket.......
....... it was like 1994 all over again, when i also needed a bag to carry the phone.
My dumbphone fit in my jeans jacket front pocket without problem.. a smartphone even the smallest model dont fit.. and that small smartphone would need a tiny pin to type on the touchscreen keyboard if you going to have a 3" or 4" screen.
Edit
My phone in the mid 90's VS a modern smartphone.
.
