I was unaware of this issue and have been working on college assignments in Affinity Designer up until now. The inability to export as an Illustrator file has caused me to lose very valuable time and I may even have to go back and recreate all of my work in a different software now. This is a very major drawback of Designer and it has left me very unsatisfied with the product. For this drawback alone, I would not recommend Affinity Designer to any other serious graphic designers.
Can a member of staff please address this and let us know if it is something that is begin worked on?