Its stupid we cant use Sparrows on Mercury. And dont give me the whole "Map is too small" argument. If that's your argument travel to Titan, where you can use your sparrow, which is dumb. It is smaller and harder to ride your sparrow. I never use a sparrow on Titan. You dont need too. You can run everywhere faster. And there are 2 fast travel points. Mercury is more open and takes forever to get places because 1 fast travel point and no sparrow.
Thanks for the post. Last year, we were looking at some QOL topics to address. Sparrows on Mercury was one of them. An issue came up when developing the change, which was towards the tail end of a development cycle, causing builds to crash. There wasn't proper time to investigate, so the change was reverted and the item was placed on a backlog, as other items had higher priority. (Ex: Developing Forsaken, other QOL changes, etc.) I'll check with the team to see if this can be re-evaluated for the future.