[throwaway7783]

What makes Figma more complex?

[trenchpilgrim]

Check out their old blog post on how they got real-time collaborative editing without conflicts to work: https://www.figma.com/blog/how-figmas-multiplayer-technology...

[sfn42]

Collaboration and the whole editor UI in general is a much more complex task than your average glorified PDF with some dynamically rendered data.

It's not the Pinnacle of complexity, just more complex than your average app.

[tracker1]

I'd say the multi-user aspects and level of scale add quite a lot of complexity in to the mix.