Personally, I have no issues exporting selected Tasks.
To achieve a desired result, it does require a bit of planning and effort to correctly set up the Tasks and Tags to subsequently filter and export for your needs.
In fairness to the Users, I had to figure this out through trial and error, as I could not find any help on this topic.
But, once I figured out a structure that worked for my requirements, I can filter and export very easily.
Great app!