Hmm interesting... I've never even opened search in the app. I equated "Search" in the app with the idea of search here on Steemit, which isn't that great. In my opinion, getting to the list of popular tags should be more readily visible and intuitive - how about a tag icon on any feed/list view in the upper right?
I've seen that you can click the tag icon in a post, but that's not handy if you're trying to go to a specific tag quickly, say photography. Navigating tags in the app should be as easy as navigating tags on a new/hot/trending page here on Steemit.