Absolutely LOVING running @CachyOS on the 2019 Macook Pro! This thing is so snappy now. I loved it so much I gave my kiddo my Dell laptop with a better graphics card so I could take the Macbook back from him. The whole fam-damily has Linux now.
My steps for success:
1. https://wiki.cachyos.org/installation/installation_t2macbook/
2. https://wiki.cachyos.org/installation/installation_on_root/ (use rEFInd)
3. https://wiki.t2linux.org/guides/postinstall/#make-modules-load-on-early-boot
4. https://wiki.t2linux.org/guides/hybrid-graphics/#enabling-the-igpu
5. A couple final tweaks for suspend that I have scripted here: https://github.com/lilithmooncohen/t2linux-fix