And it's not just Figma's collaborative features. Figma made fundamentally better decisions about design tool feature set. Better vector editor. Better concept of "symbol" as a component. Much better approach to auto-layout. Much better approach to shared colors / text styles.
At every step, Figma is just a better designed design tool. And a large part of why it's taking the design world by storm is exactly that. Most design work is done alone, not collaboratively dragging elements on the screen. Figma is just a great tool. Sketch is trying to catch up, but they would need to modify a LOT of their past decisions to get to the spot Figma is at.
As a designer your work must be detached of workflow sentiments. Tools are tools. Nothing more. I can make a great UI with Inkscape any day I want.
As software development is changing, UI design tools are changing. Inkscape has no concept of Symbols or Auto-layout. Sure, you CAN establish a design system in Inkscape, but it will be mostly copy-paste and lots of resizing.Figma takes this a step further. Design components can be connected to JS components using Storybooks. Localization can be automatically applied to designs, and elements will automatically adjust because of a powerful, flexbox-like auto-layout.
Sure, you CAN make the same design using Inkscape. But Figma enables previously impossible workflows and makes the end result -- user experience with product -- better.
A screwdriver and an electrict drill are both tools.