Just to throw an alternative thought out there….
I switched Eric (from the forum) from a 7 step approach to an 8 step approach and it paid huge dividends. Off the top of my head his hurdle PR dropped from 15.0x pre-switch to 14.51 in one year. I’d attribute the majority of the improvement to his improvement over the first 3 hurdles.
I think it’s more realistic that coaches of good athletes who are competent at hurdling should now be considering BOTH the 7 step and the 8 step as viable options as opposed to thinking that most top athletes will be better at just the 8 (or 7).