My issue with Hart's programmes is that he was getting guys that were bringing a lot of raw speed to the table, then piling on the longer work.
If you're running low 10 then you can afford to lose a little bit of the top end and still go through 200 in mid 21. If you're a 10.6 guy, then neglecting that top end is going to have some serious issues with your speed reserve.
That's always been my issue too, but you can't argue with his results. Hart said it's a lot easier to coach endurance into sprinters than to coach speed into 800 runners.
This program doesn't neglect top end speed though. The Saturday work plus the very specific gym on Tuesday means 2 days are spent specifically working on acceleration and top speed.