I like the options for many reading plans and guides within the app. I like the notification system built in for those guides as well. But most importantly, I like the ability to cross reference different transitions of the Bible quickly and in one spot. You can even do parallel comparisons which is very convenient!
There are a few things I wish were available within the app.
The first is something I have found I need on a regular basis. There are times when I'm reading through certain passages on my own for my daily consumption and then will click on a link for a reference in a study guide or switch to a different place when following along with my pastor on Sundays. When I make that change, it treats that location as the last location where I want to pick back up when I resume reading. It would be nice to have a way to hold a reference without having to bookmark it.
For example, I'm reading through the Psalms, and I stopped at Psalm 61. Then I go listen to my pastor who is teaching from Romans 4. I would like for a way to be available to hold the Psalm 61 position to easily flip back and resume my progress readings which sometimes are not daily. Having a few of these resume points would be nice.
I was able to find this app which fills the gap for the above desired feature. It's not exactly what I would have in mind for a built-in feature for YouVersion, but it does help me keep track of what I have read and where I need to continue.
Another feature that they offer is the ability to take notes for a verse or a block of verses. These notes usually tied to a specific translation. What I have found is that it would be nice to have a study feature that allows me to take notes separately from verses yet tie back to those verses even across transitions. Currently, the notes are anchored within the content. What I would ask is for is a way to have a section in the app (maybe called "Studes") for notes that links to the verses. The notes would be grouped under a study with links to verses. This is especially helpful when the study is topical.
I did reach out to YouVersion asking about contributing custom studies to their application. It's not exactly what I had intended in order to accomplish some of the functionality, but it might be worth looking into for creating simple reading plans like I would choose.