I work for a Figma competitor doing R&D. Both our product and my testing setups use React. It's completely fine and workable, certainly to get started, but also not at all necessary.

The place you're going to end up spending a lot of time (depending on the user input gestures you intend to support) are A) two-finger panning and pinch-to-zoom in non Safari browsers (Safari's GestureEvents makes this a LOT easier). B) Robust touch support when the number of touch points changes mid-gesture. C) Detecting the difference between a trackpad and a mousewheel (assuming you want to map the mousewheel to zoom).

React wont help with any of the above, but it also wont get in your way.

You'll also be running into all sorts of fun rendering issues (browsers implement minimum and maximums on font-size if you're using HTML text), performance (fullscreen canvas 2d? ooof). If you find yourself headed towards WebGL, the usefulness of React becomes incredibly (though not completely) suspect.

Good luck!