> There are a large number of fundamental impedance mismatches between relational data and object based data

My experience tells me that the largest among these impedance mismatches is the inability for OOP languages to express circular dependencies without resorting to messy hackarounds. Developers often fail to realize how far they are into the dragon's den until they need to start serializing their object graphs.

https://github.com/dotnet/runtime/issues/29900