When it comes to taking players on 1 on 1, yes I see your point, but speed in football is more than just 1 on 1, so top speed is far from irrelevant. A person who may be fast on the first few meters may not run fast over a "longer" distance, while a player who's not that fast on the first few meters can run fast when he hits the stride.
Spurs under Conte rely quite a bit on counter-attacks and counter-attacking is not just 1 on 1 but having players run into the right positions, often simply by using top speed to outrun the opposition, and also running with the ball at the feet already in full stride.