Earlier quoted context omitted.
Does your phone silently and reliably upload all the photos to your server? My guess you're conceding on that part. How's the offline app support? My full library (30k items) is available on my phone (not in high res). There are a lot more concessions I'm sure.
I’d gladly trade manual but bulletproof sync over paying a fee forever for essentially… storing files on drives. We got to this stage of having to sync because Apple can’t stand putting more storage on client devices.
It's not why I use sync services. All my photos fit on my devices (more or less). But I want to have seamless access to my files from both of my devices. And most importantly the sync is my first line of backup, i.e. if my phone gets obliterated I don't loose a day or two of files and photos, I only loose a couple of minutes.