Package repositories, recipes, and support paths
The existing stuff needs to be adapted, not reinvented. In my time as packaging some software for my own use under openSUSE I barely seen software that needed adaptions in the package spec file for other CPU architectures. Emulators were the most common exceptions I encountered and even that changed a lot since then thanks to upstreams porting those to Android and Apple M processors. Collabora lists as main challenges the ability to access the upstream source codes for reproducibility, not "repositories, recipes, and support paths".