Reminded me of a Planet Money podcast episode with the milk.com owner, who also had early internet years domains. Fun listen if people are interested. [0]
It's possible if you do a wipe and do a fresh install. You essentially boot into the Sequoia installer. I'm also looking at possibly picking up a M5 MBP and was the first things I looked into.
On android you can, usually, go into the settings, go to the app section, go into the specific app you wanna downgrade and, if it's an app that comes preinstalled and can't be deleted outright, you get an option to "remove upgrades" or some such thing.
The Shield Pro is perfect for me and I have no reason to upgrade. Have mine downgraded and de-bloated using this guide [0] running a custom launcher. Like you said being Android and more open helps a lot.
[0] https://www.npr.org/2025/09/03/nx-s1-5526903/domain-name-val...