That is why the web site is so bad, it's made to translate easily to a mobile device. I tend to search and scroll through long lists. I don't care how good the app is, there is only so much that will fit on a screen with that design, and I like seeing many items, with legible descriptions, at a time. I've better things to do than stare at a tiny screen with only a few items per page. I've better things to do than stare at a 24" screen with the same few items fitting per page.
Also, ebay removed wildcards from the search. The new search does not find things the wildcards did. So now it requires many more search terms because it cannot handle plurals and suffixes correctly (yes, I tested extensively before forsaking ebay). This is the same search engine the mobile app uses.
I do not shop from my phone. As a matter of fact, I do not shop from any device I did not install from scratch and configure myself.
I use photo sites differently, I don't search for a plethora of general items; I am very goal oriented and search for specific items - I rarely browse. Why do I need to see every model Bronica back in stock, when I only own a GS-1? Why do I have to scroll past prisms when I'm in the market, and specifically search, for a PG lens? The search is a matter of basic and proper configuration, and proper indexing/cataloging. From the looks of it, they purchased/hired a "box" solution (likely with promises of increasing sales by exposing customers to "other" items (that do not fit what the customers own)). I'm sure they paid good money, so the new site won't change much. It will improve, but only within the very limited constraints of the design concept. This does not prevent them, however, from keeping the old site as well, which was very useful for lack of those constraints.