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over 5 years ago from Kyle Galle, Design Marketing, UI/UX @ Adobe
Only the new kids on the block get the rounded corner treatment: https://blog.prototypr.io/designing-adobes-evolving-brand-system-6d243992cedd
Thank you Simon for the question and Jakub for posting this article by Sonja. She does a great job of providing the details on how XD and several other apps from Adobe have rounded corners as part of their icons.
It still triggers me that they are different :p
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Only the new kids on the block get the rounded corner treatment: https://blog.prototypr.io/designing-adobes-evolving-brand-system-6d243992cedd