To low rating player like me (1900 USTAA) serving contributes a lot to my game, but I think it also took time from me from practicing more footwork or other techniques.
I have seen a guy used to be 2700 (and now only 2500 as he approached 50's) never won a point by serving. He served enough to not net opponent have a good return, then develop a 3rd or 5th ball attack or get into long rally. I can't even return his simple 3rd ball backhand flip regardless how strong I return his serve.
I really think a good player must know how to do with the 3rd and 5th ball after serving. Some people have a very good serve but only learn their good serves are good only for much lower rating folks and are bad against high rating folks.
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for 10 screens.
1900 USATT rating on WEST or EAST coast among older adults is usually a true 2000+ USATT level (1650-1700 TTR in good ole Deutschland) not really a low level, VERY FEW achieve that level. YES, it isn't much compared to the top elite level, but it is almost top 10 percent.
Yet you did it and it is something to be proud of and for others to see at a minimum to understand its consequence. (Especially if you started late)
This is a high enough level to play almost blindfolded vs the average club level median player and still win giving away 4 point handicap after drinking 4 beerz in 30 minutes prior to matchtime.
Now as much as I agree with you on you example vs the elite player you mention, I still must stress the importance of showing heavy and varying it with the right placement to prevent attacks or at least make them predictable at that level.
Personally, I give fits to many way above my level on serves. my approach is so different and so are my whip mechanics.
Obviously I have a lot going on (deficiencies) to justify my rating being only slightly above yours. I simply have a professional disagreement over philosophy and application.