That whole market was Photoshop and Illustrator for a long time. That changed because of better and cheaper alternatives (like Sketch).
They have tried and failed to get it back and now seem to have given up on competing and just bought the competition instead.
It's also not just UI. Figma is a very capable vector and general purpose graphic tool. Figma made a lot of common things much easier than they are in Illustrator and Photoshop. While being online and fully collaborative. It's really an amazing tool and imo Adobe was rightfully threatened by it as I don't believe they could deliver anything close. It would just continue taking over more use cases.
While Figma is a great vector tool it doesn't hold a candle to Photoshop when it comes to image editing. There's a reason photographers use Photoshop for retouching photos.
They have tried and failed to get it back and now seem to have given up on competing and just bought the competition instead.
It's also not just UI. Figma is a very capable vector and general purpose graphic tool. Figma made a lot of common things much easier than they are in Illustrator and Photoshop. While being online and fully collaborative. It's really an amazing tool and imo Adobe was rightfully threatened by it as I don't believe they could deliver anything close. It would just continue taking over more use cases.