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.

I have had a Windows+Tumbleweed dual boot installed for years on a single SSD. The only precaution I take is to disable secure boot in BIOS because it is true that Windows sometimes encrypts the entire disk during updates and prevents you from accessing Linux. In short, disable secure boot and enjoy dual boot. 😉

Arch is a great DIY system where you have to decide which tools and configurations you want to use, and this is precisely what many people do not understand, leaving the system with significant security and restoration holes.

Install a fixed distribution like Ubuntu, Leap, Debian,… and enjoy Linux and read the wikis of the chosen distribution. Once you have gained experience, install a rolling distribution.

I also use openSUSE Tumbleweed for the same reasons as you. In my case I also like the security configuration that openSUSE has (SELinux+Firewalld) and its snapshot restore tool in case of failure (snapper). I think openSUSE is one of the distributions that enforces security the most as soon as you install the system and to maintain that security I try to install only the software I need and I try not to add external repositories. I would like to try Aeon because I think it is a more security-focused distro but I still need to dual-boot with Windows to connect to my work and Aeon doesn’t allow this. In short, I use Tumbleweed as it comes out of the box and just add the packman repository. Many people think that Linux is free of malware and viruses and install many programs from aur, obs, external repositories,… without thinking that they are giving root access to code of dubious origin.

I left Arch for the same reason but in relation to my system’s graphics. If you are an end user, an operating system should work for you, not you for the system. I installed Tumbleweed 5 years ago and its snapper tool gives great peace of mind when using a rolling system. My advice, try Tumbleweed, its package manager (zypper) already supports parallel downloads and although it is slower than pacman, it is more complete in package and repository management (an example is what has happened in Arch recently with firmware packages and that requires manual user intervention because pacman cannot make those changes automatically).