I ended up getting one for development. It proved useful enough that I used it myself, but I've managed to limit usage to WhatsApp (and SMS), web reading (like HN now) and not much else.
Lots of Web stuff (especially financial stuff) requires 2FA so SMS is now more-or-less required.
People have learnt though that my phone is always on silent, and I mostly don't check it during the day. I don't have email on it, and I don't do social media. I treat it as "my device" not as an "interruption device".
Of course the joy of them is that for every person it's different. You can use it whatever way you prefer.