Giving the user a choice doesn't weaken it.
Users can still choose to burn their fuse.
The other day, told me they're not anti-owner-control, but forcing an irreversible fuse burn on users when it would be easy to give an option, doesn't reflect that...
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There is no way to provide an option for that. It's a necessary step as part of securing the platform. End users don't get a choice about moving to Android 13 if they want security updates, regardless of what OS you run.
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The OS is what burns the fuse. It should be entirely possible to remove that code, and make it conditional on a post-installation prompt.
If the user says "no", they can still use the modified Android 13 without burning the fuse.
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We aren't going to disable a security fix that has no impact on end users.
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For example, this means I cannot even _try_ GrapheneOS anymore, without losing my ability to keep using LineageOS if I change my mind.
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As stated, all operating systems on Pixel devices must be on Android 13 to get full security updates. There isn't any leeway there.
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As a user, you have the freedom to stay on an old version, at the cost of having missing security content, which I don't really suggest.
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But it's entirely possible to install (a modified) Android 13 and NOT lose the ability to downgrade.
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You do lose the ability to downgrade the Titan M2 firmware regardless of which OS you use and based on our experience with the migration from Android 11 to Android 12, they do not preserve backwards compatibility. We're the only ppl who noticed since others don't use what broke.
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Secure element firmware on Pixels has had anti-rollback counter incremented repeatedly over the past few years.
They've fixed verified boot vulnerabilities in firmware for each gen of Pixels which should come with an anti-rollback counter update but they chose not to do it.