If we want to create simple circuits that store information(latches,flip-flops) we might try as an initial attempt to just connect the output of a gate to its input.
In the first gate (OR) after activating the input,we can indeed see that it stores the bit. But even by deactivating the input,the bit is still ON. So we dont have a way to Reset the bit,only to Set it.
In the XOR case we can see that the output is unstable and it oscillates between one and zero.