Edited.
I came across an issue in ArcGIS Pro 2.9.12 where the Make Route Event Layer geoprocessing tool was much slower than previous versions (2.6.8).
Route Event Layers — Slow performance in ArcGIS Pro 2.9.12, but not in 2.6.8
That performance issue is a significant problem for my unit. We can't upgrade from 2.6.8 to 2.9.12 (or 3.2) because route event layers are unuseable in 2.9.12. (My organization will upgrade to 3.x eventually; that's beyond my control.)
I'm wondering if that kind of performance issue could have been caught by benchmarking GP tool execution times against previous versions of Pro. Could that be incorporated into existing automated Esri testing mechanisms? And could the results be released to paying customers as some sort of new documentation product?
For example, if that had been done, then it would have been clear that the Make Route Event Layer tool is significantly slower in 2.9.12 compared to previous versions. That would have raised a red flag [for Esri and for users planning to upgrade].