Keep in mind that a pitcher who throws 90, even once, has that follow him around for life. Even more so, a pitcher who throws 90 for a period of time, say a fall PG season.
What I am seeing at the senior HS level is pitchers whose Velo has dropped off. Saw one LHP ( lower D1) who has a nasty curve and hit 85-86 consistently last fall is now low 80's and getting hit. Another RHP who hit 88 ( lower D1) as a 16 yo is now low 80's at 18 yo. Another who threw low 90's, sat high 80's(P5) is now struggling to even pitch....this is more of a health issue.
I could go on and on, just in my little corner of the world. I see a lot of pitchers training for Velo, and achieving it as early as 14yo, but I wonder about the cost. Seems that a lot of these kids are burning out before they even reach college.