On Firefox there’s a setting to have the tool bar at the bottom.

the Dual Intelligent Touchpad further enhances your gaming experience by providing responsive and immersive motion controls

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It doesn’t include the Playstore per se, but it does provide an installer for a sandboxed Playstore.

Give Grapheneos a try!

Google Pay and RCS don’t work. Third party launchers shouldn’t be an issue if you don’t give them network access. That’s how I use Nova.

Posting from my Oneplus 9 Pro running LineageOS as a proof we do exist! There are dozens of us. DOZENS!

It’s actually an OTA update.

KDE system settings → Power Management → Advanced Power Settings

The problem is vendor support. As soon as a device stop receiving OS and baseband security patches, it becomes potentially insecure.