I use several devices, lately usually HTC or SONY. I run my own build based on a barebones cleaned up LineageOS ( no Lineage applications or many libraries ), just need the core OS and monthly security patches up to date. Applications are my own binaries, packages available through Termux, and from developers either through F-Droid, GitHub or XDA forums.

I only need LTE and very rarely WiFi, so Bluetooth and NFC if available on device are disabled and neutered. Devices are encrypted but hold no data other than that in use, all data is always kept on external encrypted cards, and those go up to a tera now, so no issues even with large, very large files. Makes no sense to me that people tie data to a device, be it laptop, smartphone, tablet or desktop.

The 'phone' part is just for emergencies; police, ambulance, that sort of thing. Otherwise even a mid-range device works as a fully fledged laptop substitute for me, can be my main computer, and has for years.

Edit : Most of what I use is open source, and no adware, spyware, analytics, or crash reporters anywhere on my system. The current software business model based on data mining needs to die. Also, a decent web browser does, and better, what 90% of so-called 'apps' do.