Do we have evidence that "02 <x>" or "03 <x>" is more widespread than <x> for NIST curves? I haven't seen "02 <x>" or "03 <x>" in deployed products in TLS / X.509 at all. So, I feel that for TLS space the slate is clean regarding compression. X25519 uses one coordinate, which is simiiar to doing <x> for NIST curves...
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