Completely depends what you're looking to do. I used my Pixel 5 running GrapheneOS to test and release an app I have in the Play Store. I run a small business

Completely depends what you're looking to do. I used my Pixel 5 running GrapheneOS to test and release an app I have in the Play Store. I run a small business from it (email, e-commerce, fulfilling orders, etc) I run Termux and full fat Linux apps on it. I can use git and GitHub on it. I have an SSH client I use with WireGuard to access my home network. I can control my 3d printer with it. Not sure what else "a dev" needs to do with their device, but GrapheneOS provides everything I need, and I like to call myself a developer.