I agree with you, but for Linux-based mobile phones to advance, pressure would need to be put on large financial institutions and instant messaging companies to allow their applications to run outside the Android ecosystem. Regarding the brands you have chosen, I think it is also important to directly support EU-based companies such as SUSE, which focus on open source and support Linux development projects such as openSUSE. As for hardware companies, there are several that specialise in distributing hardware optimised for Linux, such as Slimbook and Tuxedo, but I believe it is more important to support companies that focus their business on the development of FOSS code than companies whose business is to distribute hardware manufactured outside the EU.
It all depends on how much time and energy you have to configure and maintain your system. If you want a rolling distribution and don’t have much time available, I would recommend Tumbleweed because it strikes a good balance between constant updates and operational stability, as it comes configured with snapper, a great tool for restoring the system in case of an update failure. If you have more time available to manage your system, I would try Arch directly because I am not in favour of using distributions that do not have control over their own repositories.