He's considered the greatest investor because he was able to apply Ben Graham's principles, and laterly Phil fisher during the prime years of value investing I

He's considered the greatest investor because he was able to apply Ben Graham's principles, and laterly Phil fisher during the prime years of value investing I'd say in the past 20 years we've seen states propping up their markets more with QE so we don't see the same crashes. Information is also more available to all