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? Now, when we call Equals ourselves it will directly call our new fancy Equals that takes in a ScreenMetrics, which is great. https://trevorxejlo.bloggip.com/28108547/c-istructuralequatable-nedir-ile-ilgili-detaylı-notlar