After reading several threads on this general topic, it looks like this is exactly what I'll be needing to do (in order to facilitate a logical Sort/Display by date taken in the Finder itself, independent of any processing/exporting via the Photos app).
Couple of questions: 1) Would "A Better Finder Rename" actually need to be the companion "Better Finder Attributes", or are those two now combined into a single utility?
2) Do any (or all) of the three you mentioned support batch changing the Time (by a user determined +/- amount of hours & minutes) or the Time Zone, with or without adjusting the numerical value being displayed -- in other words, change all the selected files from 9:10am EDT (and onwards) to 6:10am (and onwards) PDT, OR change all the selected files from 9:10am EDT (and onwards) to 9:10am (and onwards) PDT? Adjustments that were always relatively easy to make in Apple's still-lamented Aperture, and required the "intervention" of no 3rd party app whatsoever.
3) And finally, would Adobe Bridge be another candidate worth considering in the EXIF-editing line up, again just to try and make up for The Finder and Photos EXIF shortcomings?
All opinions appreciated.