PERFECT
Combine these apps together… - Phoom - Find: A modern photo manager - Apple Photos … and you have the ultimate cross-app compatible powerhouse I was looking for years (e.g. useful for workflows in Photomator, other raw photo editing apps, HDR Affinity Photo and so on), even when these apps do not have built-in flag/reject or star rating tools! And also it has the crucial Live Photo view support I was hoping for! For example: „Find: A modern photo manager“ App -> Create intelligent albums, based on date range, or „Day 1 of your vacation“, „Day 2 of your vacation“, and so on. They update automatically each time new photos will be added matching the specific criteria. Now you know exactly what you can cull. „Apple Photos“ App -> Create a manual YES album, create a manual NO album. Or even another manual albums e.g. with ratings: 5*, 4*, 3*, 2*, 1*. Or albums for +EV, -EV, NEV (Bracketing / HDR candidates). Or another idea: Create a manual LOCAL album, always update it manually on a regular basis by filtering on „not family library shared photos“ and add these to this album + remove the shared ones from this album afterwards so that you know which photos are not yet part of the family library for culling :-) „Phoom“ App Move these albums YES / NO to the beginning of the bottom bar using the sorting function. Also drag the intelligent ones created by „Find: A modern photo manager“ App here if you want to. Cycle through the intelligent albums with a long tap, then cull quickly by double-tapping on the YES or NO albums for each photo. The image counter below lets you know when you‘re finished :-) Later on when everything is clear - cycle again through the images and look on the highlighted YES or NO information each time. Then, move over to the NO album and delete them all at once. This will help you especially if you are like me and want to hold on for a last view on the rejected ones, instead of immediately shifting the rejected to the paste bin and getting them out of sight (as recommended in „Phoom“ by swiping away). Also if you want to keep track of which photos you already have culled or not yet! Now my family will become happy again because the images will get into the iCloud shared photo library much quicker - lightyears ahead! Thank you @Lukas Goehlich!