After Apple suddenly discontinued Aperture, which left users like me with huge complex photo archives hanging, I will never trust any professional software tool from Apple again. It is a disaster that I still haven't fully recovered from.
I've learned my lesson — all my archives will now be maintained by me, in file structures, with metadata in text files.
Me too, with Aperture. Huge misstep and insult to the user base.
This is a useful tool: https://github.com/cormiertyshawn895/Retroactive
However, you still need to run an older OS. I've still got on my todo list the process of fixing all of this.