I was living with a Nokia since 2018 but things changed my last birthday, because my wife bought me an iPhone SE.
I don't use any "traditional" social media but using Safari daily for websites I like to visit and a mail client for async communication. Friends with iPhones can send me iMessages and there is an underrecognized, privacy oriented, instant messaging application for inter-family communication. Using few offline and online dictionaries, two online education apps, three content/web blocking apps, four games, lastly some printer-related apps and few more government/banking apps. Camera is useful and fun, if I remember my phone has one.
I am forgetting to check my phone often, not even for time or weather. My life same with a smart or dumb-phone nowadays, honestly; never feel less or more isolated. Outside it's functioning like my former Nokia - answering or making calls, using it's "smartyness" mostly in home. Maybe an iPad would be a better for me with a dumb-phone?
But I felt same things when I ditched my first smartphone and it's socialness, concerned about the reactions of "other" people. Nothing interesting; I didn't and still I don't crave for notification ocean, Facebook or WhatsApp groups, busy-ness networks, pictures of beverage or food, instant messages, location based suggestions, etc. Things were settled. Except the some part of government and some banks; nobody insisted about smartphones, locations, apps or social media services.
Benefits? Of course, yes, hell yeah. Because things weren't "mediocre" for me like nowadays, I started to ditching social media and so-called smart culture in 2012 and learnt new things about myself and life, regain some lost things; like some of my focus on people and daily life.
One example, I was only once lost in a big city (think a metropolis, one of the biggest in the world) in my whole life because I trusted the location services of a giant company and its smartphone application.
Another common one; I was stuck in some sticky situations thanks to smartphone batteries and unreliable touchscreens, middle of nowhere.
Some big goompany decided to close my account and I almost lost some data, today still no answer or explanation about it.
These are a few simple examples why smartphones are not okay for me, not the worst ones in my experience and opinion.
As a last note; I developed applications for smartphones, trained smartphone developers.