It hinders you because you aren’t doing a thing to improve what you are trying to accomplish. If you think sprinting more than once every two weeks isn’t going to help, then quit wasting your time competing. It isn’t even worth arguing about whether or not a 400m sprinter needs more than one sprint day every two weeks.
I’m thinking about summer season, not winter. Adapatation to fast sprinting is pretty quick, I noticed 6-8 weeks of fast sprinting and usually my max speed plateus. After a month I’ll keep max speed sessions once a week and still I’m going to have 7 month of training before summer season, later I’ll move to two times a week and in spring again about once a week b/c of speed endurance sessions. So are you suggesting to sprint at near max speed all year round and at least two times a week? Now it’s time for max strength improvement using mainly heavy loads and this is the main quality which I’m focusing on. I won’t get any extra benefits of sprinting fast too early and too frequently in the season. To your logic Hart is doing garbidge job with his 400m runners b/c they don’t do enough fast sprinting earlier in the season?