Until you approach that one very grumpy immigration officer that insists on a paper copy which it clearly says on the official visa application website that you should do. Where to find that printer then.......?
I have a friend that I helped doing exactly that. A6, laminated. Took an A4 with him just to be safe. The immigration officer att BKK airport even said "this is a very good idea". So yes, it works 🙂 As long as they can scan the QR-code, it is OK.