I also don’t like having a global bonus location, as that could cause some issues, especially with those that are unfamiliar with some areas of the world, those that don’t do extra research outside of the review page, prefer reviews in the language their most comfortable with, etc.
I do like changing the bonus location more often, as well as coming to a place like the forums, Reddit, Discord, etc, to find out what areas may need some help clearing out their queues.
BTW, there is a similar discussion going on here: Remote areas stuck in a loop — Request for bonus location reviewing