Ask HN: What currently is the best, nerd-friendly, rootable Android phone?

My network provider has turned off 3G and despite my current device supporting VoLTE appears to have blacklisted it on the basis of its model name and I cannot make calls any more.

I like running rooted Android because of systemwide adblocking, the ability to run things like Frida and inspect or modify applications, and _ideally_ be something where I can get CTS_BASIC_INTEGRETY – my main bank (Monzo) works with other OSes and rooted phones quite happily, but having the ability to play the highly irritating fun and games is a bonus point. I despise remote attestation and DRM and ideally would have something that fails from the start (!). I'm aware of the security issues with running a rooted Android device; I just frankly don't think that in my threat model that they are that severe. I'd much rather have the freedom to toggle on/off Secure DoH, change my SIP routing, and spoof settings such as my geolocation for legitimately good purposes (e.g. network-level VPN to a different country!).

I've experienced /e/ OS and CyanogenMod in the past and would like a privacy-focussed, ideally open source OS – linux would be perfect but unfortunately it just appears that the totally free Phone OSes aren't ready for prime-time just yet.

What is the best – or perhaps "least worst" – hardware to run something natively rooted on, or an OS like LineageOS? Is there a single manufacturer that supports this? At the moment I probably lean towards the Fairphone 5 but I honestly would love to know of the least worst option.