It's Normally expected that if you implement IEquatable.Equals you will also override Object.Equals to be consistent. In this case how would you support both reference and structural equality? = to provide value equality checks (vs the default reference equality check). The MSDN documentation suggests you only do it for immutable https://cristianqbjry.eqnextwiki.com/4265537/büyülenme_hakkında_c_istructuralequatable_nedir