Yes, because UX is not an exact science.

Aperture discontinued, one of the engineers in the team built a replacement, yet it's not Aperture.

Pixelmator did the "impossible", Apple bought them instead of doubling down on their talent and resources.

Small yet powerful editors like Acorn and Camera Bag Pro has no practical competitors in their spaces.

Technical problems are easy, yet humans and things involving human interaction is hard. You can't solve non-tangible problems by remixing tangible bits of code.

Heck, even Photoshop revamped a couple of dialog boxes, and a number of people got angry, because it behaves slightly differently and throws decades of muscle memory out of the window, and that costs people considerable amount of time.