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BIP 43: Reserve purpose codes for SLIPs, and describe a scheme for altcoins #523
They can already do this. They can use any purpose constant they want.
BIP44/43 are sufficient as-is. The only thing this PR should be concerned about is the reservation of the purpose constants for SLIPs.
Without coordination, however, the chance of more than one coin using the same constant is very high.
The link you provide illustrates exactly why it doesn't work well: the BIP44 scheme is poorly suited to coins that don't use UTXO mechanisms, resulting in different wallets interpreting it differently and using incompatible derivation paths. The 10 wallets you mention are using 3 different mutually incompatible derivation paths.