I don’t use APFS on the big spinning drives where the pix are. But they definitely are on my iMacs and MacBook ssd’s. Yea Lightroom has a Validate dng feature... of course it locks you into Adobe.
Yea, no kidding, I wish apple would open source server.app, so some of the old components could be updated without hacking it. It was just a perfect all in one solution. I will check out Photostructure.
One man shop pro fotog here. My macOS server 5.6.3 High Sierra is awesome, the last complete version... File Server with literally decades and multiple terabytes of raw photos… The ease of the email server is unmatched…. Websites and Nextcloud, invoiceninja, all just work with minimal php tweaking…. and all here IN MY OFFICE. I have linux droplets, and am more or less ready to make the move, but I won’t until it actually dies… but only when I have to. I hope the hardware (from 2010) holds out forever, but I do have a spare ready and daily CCC backups and disks rotated to firesafe… at least for me it just works. Knock on wood.