There are shades of grey in between.
Quite a few posts here are written under the assumption that the world is partitions into two groups of people: the pro photographers with heavy and expensive equipment, who routinely do heavy-duty post processing, and the iPhone photographers, who know nothing and don't care about photography at all.
Well, there is at least one more group of photographers (which includes at least one person - myself). People in this group like to shoot with DSLR, know something about photography, but do very light post processing (and usually stick with JPEG rather than RAW).
I manage a library of amore than 80,000 photos. I tried Aperture and found it very powerful, but decided that for my relatively simple uses, iPhoto is simpler and more intuitive to run. I hardly do post processing, and when I do, the tools of iPhoto are sufficient for me. I do invest in organization: all the faces are tagged, I assign keywords, and create many smart albums.
There are two main issues with iPhoto that I would like to improve. First, its performance. While its performance on my desktop is OK, my Macbook Air has some difficulties. From the reports I read until now, I understand that Photos has much better performance.
The second issue is the problem of working with the same library across several machines. iCloud Photo Library solves this problem - but the cost is too high (10 times the cost of the new offer from Amazon).
I don't understand why anyone expects Photos to ever be anything but a rudimentary beginners app aimed at the iPhone set. Photos is a free app bundled with the OS. You can't expect a lot of value from a diamond ring you got as a prize in a box of Cracker Jack.