Many in tennis are fanatical about technique. Everything from a player’s grip, to their elbow placement on the forehand, to the degree of knee bend on the serve and everything in between. Some coaches take it to the point where you need a ruler, a protractor (and perhaps a PhD) just to analyze a basic groundstroke.
While I too believe that technique and mechanics play a vital role when it comes to playing high calibre tennis, we must respect the uniqueness of each individual. Take any 2 players on tour and compare them side by side, you’ll notice that variations exist - even when attempting to execute the same shot!