Easier to log in to the game than ... what? Than using the app on my PC which is currently not even one of its features? Yes, obviously. As I said, though, I'd like to use it WHILE logged in to the game. Specifically, I'd like to use it for things I CANNOT do in the game currently, such as:

1. price checks without going to the market board (especially for other worlds, ideally the whole data center, although I understand the app currently locks your market board searches to your selected character's home world; I was endeavoring to keep the post focused on a single suggestion rather than creating a list such that what specifically people are "liking" becomes unclear)
2. the ability to move items directly from one retainer to another and from inventory to retainer even when not at a summoning bell

As for more features BEFORE porting it ... both of those suggestions sound great, although I don't know enough about precisely how their development prioritization works to know that encouraging a PC port would somehow be discouraging those other improvements. My understanding is that the companion app is going to be indefinitely updated, so whenever it gets ported to PC doesn't preclude any additional features from being added on any/all platforms.