ripemd160 is necessary for Bitcoin light clients, which have been broadly deployed. It is also in somewhat regular use by some user interfacing with arbitrum
See my comment re blake2 f-function here:
As one of the people who initially pushed for EIP-152 and helped write it, I think a post-mortem is long overdue. I may write a full one for a blog sometime, but here’s the condensed version:
Fundamentally EIP-152 failed for 2 reasons
Politicization of the proposal led to a weird technical design.
Implementing the F function instead of the hashfunction was political nonsense. It should never have been done. It led to a bad result for everyone.
Envisioned use cases were not validated befo…
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