OK OK - I guess both experts have some valid points.

For me personally, possibly due to my low carb diet, I see decent gains just doing Z2. Recovery is a big part of it - I just don’t recover well from intervals or intense sessions, so my overall volume suffers.

San Milan’s work is more than just about cycling performance - it’s also about researching the effects on heath issues and disease. I’m biased towards his line of thinking because of this, and what he preaches works for me personally.

And I’m not out doing any crit or TT races - my goals are to improve my steady state power outputs with the ability to hit the higher zones when needed without blowing up. So large amounts of Z2 with a few blocks of intervals here and there to polish things up seems to work well - for me.