Both Apple Photos and Google Photos:
1. have easy search by location on a map of the world.
2. allow browsing to any date in an instant.
3. index photos by objects/faces and allow for instant searching - Apple even does it on-device.
Also, frankly, I don't trust you to stay around for long, so I would appreciate the option to store encrypted photos on a cloud of my choosing that I already pay for, with a separate subscription for using your app. Not sure what the Venn diagram of <cares about privacy>, <willing to pay for your storage>, <needs excellent browsing experience> looks like.
Looking forward to an app which works for people with large libraries. :)