Stronger legs = Faster legs – For me its simpel
As the resident proponent and most regular defender of using heavy squats in training for sprinters, I will say that this statement is false. The relationship between strength and speed is not nearly as correlated as you appear to think. While I love squats and think they can provide a host of benefits, I’ve found doing them more than 2x per week is almost always detrimental for athletes not competing in a strength sport (power lifting, olympic weightlifting, etc). There are so many other biomotor abilities to train that to spend that much time and focus on one would surely come at the detriment of others. Not to mention the fact that the research on training volume, and assumptions from single-set vs multiple set training indicate quite clearly that the majority of gains can be made with far less frequent loading than you’re suggesting. After which point, the energy and recuperative resources necessary to recover from every day heavy squatting routines would surely detract from more specific activities that have a much closer correlation to sprint speed (like SPRINTING!).