Hey @MEB
I honestly am pretty annoyed by this problem myself. I've NEVER used a software (and I've used lots of different ones from CorelDraw :D, Adobe-Stuff, Sketch etc.) that was so annoying on exporting! I design different elements for Newsletters, Blog, Social etc and have many ArtBoards for that. I ALWAYS have at least one of those off by .3 pixels or something.
I honestly have no idea why this has to be that way and you can't just disable that globally! It's probably not really an issue for you if I switch over to another Software because this takes me 5min per project to go back and re-align all artboards to get it without a .X pixel value—because I bought it and there's no money loss for you. But despite everything I love about your work, this kills my patience more and more.