To be fair, Sketch is a Mac only program, so the team may have just been unable to use it, and preferred to just move on rather than purchasing an entire new co

To be fair, Sketch is a Mac only program, so the team may have just been unable to use it, and preferred to just move on rather than purchasing an entire new computer (and Sketch). It would perhaps been more helpful to have responded by offering to provide your Sketch assets/layers via Zeplin, which is free and web based.