The new photo app got tons of complaints.
The more I play with the app, I found there are inconsistencies in exhibiting pic in grid views.
In the library, the pics are displayed more less the same as before, exhibited tightly together in rows of thumbnails.
However, for views other than in library, including people, trip, album, utilities and search results, the pics are exhibited with THICK gaps in between thumbnails. It looks ugly, like thick gaps between tooth, as well as wasting too much display estates in particular for small screen mobile users.
The new search are boosted for having textual search capabilities, what I found as far is simply breaking the search text into a few keywords searches which had been supported in previous rev.
The good things for new photo app, only a few, are the removal of day views, the additions of auto generated trip views and showing the taken location of a photo in pic view (before it has to go to info to see the location)
The best upgrades for iOS 18 are note app and calendar app. There are some nice touch on map app too.