I'm currently using an Fxtec Pro1 [1], which has a respectable Snapdragon 835 and 6GB of ram. It was released last year with an older processor but compare the Geekbench scores to the "High end" new Pixel 5 [2]. It unofficially supports quite a few distributions of Linux including Ubports Ubuntu Touch, Sailfish OS, and LineageOS. Official support for Ubuntu Touch and LineageOS is coming next month. It's a niche device for sure but it exists, is being manufactured, and is available for purchase.

[1]: https://fxtec.com/

[2]: https://browser.geekbench.com/v5/cpu/compare/4573446?baselin...