The recordings of LZ, Procol Harum and the Beatles are hard to beat.That’s very general and trivial statement.
Hard to beat commercially -- true;
Hard to beat in terms of musical complexity and creativity -- not true at all.
Agree that Neil Young became better commercially than with CSNY, but in terms of music and creativity not. To me he's perfect rectangle with no curves or mis-shapes. Longer story short -- boring.