(OK in feet and inches sorry I don't think metric for height) Big 3 are all 6'1" to 6'3". Shap is just 6', Tsitsi 6'4" THiem and Rublev aren't that tall, Sinner is 6'2", Swartz is a towering 5'6" RBA isn't tall, Actually other than Med and Zverev who are 6;6", there really aren't that many very tall men at the top, and none at the very top.It is not only my opinion. We admired returns of serve of Agassi but now players are forced to block the ball moving over 220km/h. There is almost no time for executing full stroke. No wander that successful tennis players are higher and higher. They can serve with greater speed and can reach fast balls.
Surfaces were slowed down to prevent serving clinics like Ivanisevic and Steich (sp) a horrible era for tennis.
This is actually a golden era for tennis.
Your thread makes zero sense.