This is an easy read with lots of interesting detail on Photos and non-destructive editing. Worth your time, and from an excellent source.
From the bio at the end of the article:
Nik Bhatt, formerly Senior Director of Engineering at Apple, led the Aperture and iPhoto engineering teams for several years. Afterward, he led imaging teams for Apple’s photo applications, including the teams responsible for Core Image and Apple’s RAW Camera library. He is now the developer of RAW Power, an advanced photo editing app for Mac and iOS.
Read the article.
That was quite interesting. But pretty much the bottom line is, if you don’t want to mess up your photo workflow, don’t use Photos. (Don’t bother saying anything with the word Adobe included.)
I tried his RAW Power extension. Not usable once you’ve used some of the professional tools out there. But what you gonna do with your iPhone and iPad?
Unfortunately photo edits made on your iPhone don’t sync over Photo Stream. This is a real bummer for me.