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Motorola GrapheneOS devices will be bootloader unlockable/relockable
(grapheneos.social)
This is a most excellent place for technology news and articles.
Moto have been making phones for as long as there has been phones. Software issues would get fixed. I don't think hardware issues are likely.
The biggest risk is Google being evil and cutting both of them off from the Android source code or refusing to sign the releases. Google already refuse signing releases for GrapheneOS on the pixel.
Do you mean how you get a special boot screen implying you're doing something sketchy?
Google signing things is not something we want. We want phones that don't care if your OS is signed by Google, and banking apps that trust you to pick an OS.