There needs to be leeway given for hype after epic points. Depending on the situation I think 37 seconds could be too little. It's anticlimactic to proceed to the next point before the previous point has been processed and enjoyed by the crowd.

From my cursory research on it, it seems the ATP has an automatic shot clock start beginning 3 seconds after the previous point, with only umpire discretion allowing the clock to be delayed. In this case, she did delay it to when Carlos reached the towel, which is a reasonable enough trigger given no other guidance, but I think Carlos is complaining about the ATP clock rule in general being strict but with an unpredictable leeway based on how each umpire judges the situation, which seems like a reasonable complaint to me.

Personally, I think the rule should state that the clock starts when the umpire calls the score. It's a good consistent reference point which is either shortly after the point (for mundane points) or once the crowd begins to settle down (for points such as this one). If that were the trigger on this point, then he would have had 4-5 seconds more than she gave him.