Eric's approach is very traditional, he was a purist. In his autobiography he talks about how important it was to him at the beginning of his career. That is why he left the Yardbirds, he felt they were getting too far away from the blues. As a result he joined John Mayall's Bluesbreakers which is a pretty traditional blues band. The irony is that he helped create a new genre of blues rock that launched thousands of bands.