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[email protected] It will fully support using other operating systems including users making their own builds of GrapheneOS. It's part of our hardware requirements. We'll likely be able to make hardened builds of firmware and drivers which can be released in an official way for easy builds without needing to extract anything from the GrapheneOS or Motorola OS factory images.
I personally might not use a headphone jack or SD card slot very much, but for the market that a GrapheneOS phone would be targeting they seem like OBVIOUS things to include.
The crowd getting excited about this partnership is pretty much the same crowd that complains about features like those going away.