Reading through the comments here, I tend to think the Steam changes aren't that helpful. For TFL and the expansion I tried to hunt it down but could not find it without explicitly doing a query via the search box. This is pretty worrisome, as casual buyers or people who've not previously bought an Arcen title might never ever find them.
I did a quick experiment and went to the website via the browser and the steam app and compared. Sure enough the landing pages between the two are now so different, based on my supposed preferences, that a lot of titles show on the browser version would be nearly an instant purchase if I had the money to do so.
As the holiday season is approaching, I'd be interested to see if revenue is affected and whether it might prompt Steam / Publishers / Developers to refine the process.
At the moment, I've seen my own impulse purchases go down to zip. However that might be also because I'm too caught up in TLF and (boo hoo) work.