By itself it is just stupid. Standard defines "EqualityComparable" property and which parts of STL require it to be satisfied. There even some places where it n

By itself it is just stupid. Standard defines "EqualityComparable" property and which parts of STL require it to be satisfied. There even some places where it notes that EqualityComparable property isn't required. It is much easier to get UB by having bad < operator.