Creating portfolio pages is a hassle on WordPress even though there are a number of photography templates. Adding photos is time consuming and I am rarely happy with the layout. Making albums and browsing on Flickr, however, is easy. I can make an album in just a couple of minutes and the layout is automatic and pleasing.
I totally understand this perspective. The easier it is to publish any type of media on any platform the more you'll do it. It is precisely why Instagram exploded. It was, and remains, one of the quickest and simplest ways to publish a photo from your mobile device to the world.
WordPress has made huge strides in the last few decades to make it easy to publish words, photos, audio, etc. (as I have done on my personal blog) but it is far from simple and light years from simple on mobile*.
Flickr, on the other hand, is a good balance between simple and feature-rich on all platforms. The iOS app is very good in my opinion and the desktop/web experience is robust.
It is why I've re-upped my long lapsed Flickr Pro account. I want to support Flickr's ability to stay in business. I'm hoping to publish more film photos there for interacting with the film community that exists on that platform.
* Meaning, WordPress on iOS is still almost useless to me.