Following the GitLab repos, the kernel for the PinePhone on Manjaro is based on Samuel Holland’s fork.
PostmarketOS and Arch linux have switched awhile ago from Samuel Holland’s repo to megi’s fork for it’s base. SailfishOS has released a new build also using megi’s kernel.
Megi has been doing phenomenal job getting the most of the PinePhone’s hardware with most of the new features being introduced there.
Would a transit to megi’s fork for Manjaro’s kernel base be something to consider?
I believe the reasons outlined by PostmarketOS developers are really well laid out.