It isn't impossible, just not convenient like it used to be. What I do is sync a copy to my backup device, and use the web interface to download any collages or effects that it auto-generates.
You can then use rclone to sync deletions, which uses their API.
How do you sync a copy to your backup device? My understanding is that it's no longer to programmatically grab the original images, only compressed images are available via the API.
I use one-way Syncthing, so my phone automatically backups my pictures to Google Photos (using the Google Photos app) and my computer (using Syncthing). Then I copy them into a folder locally like they existed previously on Google Drive by year.
You can then use rclone to sync deletions, which uses their API.