What was most unexpected is how, unprompted, a lot of the most ardent phone abusers in my social circle started gradually releasing themselves from their phones, putting them in a drawer, or just outright turning them off for weekends.
I have a single prepaid phone that my wife has the number to, it has no apps, no email, no scrolly things. When we are apart, it is turned on, otherwise, my time is otherwise occupied.
There are some real-world issues with that, all of which a friend recently encountered (they don't even use a credit card). Firstly, if you don't set up internet/mobile banking, it does leave you open to someone doing it "for you." Luckily money in the bank is insured, but that doesn't help the stress experienced by a 70 y/o (who was doing all the right stuff, as she's retired intelligence). Secondly, you're going to struggle if you're forced into some situation away from your landline, such as a hospital visit.
I was able to repurpose my Pixel 4 with GrapheneOS for her: no app store, no email, no scrolly things, data disabled, no e-waste, nothing but phone calls over LTE.
I prefer to use FOSS apps where I can, and as such, most of my installed apps come from F-Droid. When I do need something from the Play Store, I simply use the Aurora Store to grab those applications (which are really just Paypal and Slack for work).
Potential issues you might run into are some apps like banking and such not functioning thanks to SafetyNet. For banking, I just use the browser anyway, have never had the need to use my local bank's mobile app.
It really depends all on your needs, but you will find that using a de-Googled device is very doable as a daily driver, and I have been doing it for a number of years now - I can't tell you when the last time I signed into a "Googled" Android device was.
I also have a few PinePhones (my first testing grounds for Sailfish, interestingly enough) and am a huge proponent of Linux phones. I throw my SIM in my Pinephone sometimes and use it often for testing development stuff. For daily driving, however, my de-Googled devices are still what I reach for the most.
Meaning the price for a consumer is steep and dunno if some of the features are useless without the matching backend. But I guess the level of security should be good. At least the folks from Bittium I’ve interacted with seem to know what they’re doing, for what that counts for :-)
But since there are plenty of apps in the froid store there are plenty of free alternatives...