That's exactly my point. They aren't designed like L2s, they are designed like altcoins. Whole-stack replacements to "fix" problems with the L1, not thin improvements on the L1 (which can themselves receive thin layers above them).
Discussion
I think the similarities between the current religions make me see them as L2s rather than alt-coins. They all have the same base layer.
Look at the similarities between Jesus Christ and the Krishna for example.
Look at the similarities between Jesus Christs teaching and Taoism.
They’re all operating on the same protocol.