With GSI/GKI mandatory for years, why do custom ROMs still need to be built form source?

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My understanding is that over time Google has pushed recreate in Linux, which Android is based on, what Windows had from the start: a stable ABI for what boils down to device drivers (the various vendor blobs) as well as dedicated partitions for them to live.This being the case, why do custom ROMs need to be built from source still? I have looked at the wikis for PixelOS, Infinity X and Lineage and they all involve variations of the same process.Shouldn't it be possible for a...Read more