Collaboration is pretty difficult to retrofit onto an existing product. A collaborative text editor like Google Docs needs to be designed for that purpose in mind, and the state-of-the-art techniques (CRDTs and OT) are still undergoing active research. See also the xi-editor retrospective: https://raphlinus.github.io/xi/2020/06/27/xi-retrospective.h...

I imagine Figma, being built around CRDTs and a web platform, probably had a number of intentional design differences from Photoshop etc.