Yes and no. Everything is fine until you hit the 2gb limit. The average professional laptop has a 16gb ram. Figma is not only the vector app. If someone wants serious vector work, Illustrator and Affinity Designer provide a solution.

Figma is more than this, and the complexity of the workflows requires offline support and more memory available to the app.:)

Has performance in Sketch fallen in recent years? I know it's not as popular any more, but years ago when I used Sketch the performance was always top notch.