Thanks for writing this great post, Alexander. Export to JPG is planned to ship with our update in November. Underline, crafted the right way (not just a line underneath the text) is almost ready, and it's looking good. Stay tuned, there's a lot more coming, such as Design Specs Beta, for developers to inspect colors, character styles, and measurements. 1.0 is just the beginning, 2018 will be amazing for XD! Thanks for your support and please keep sending us your feedback.