They are not. If I was interviewing somewhere (I work as a UX designer) and they were still on Sketch, that be a pretty big red flag for me. Using Sketch today would be like using Illustrator during the Sketch era.
Until fairly recently, Figma was stuck in sRGB, while Sketch supported wide-gamut color. It blew my mind that designers were ok with this.
Anyway, if I were interviewing a designer, I’d look at their portfolio and just ask if they’re comfortable using whatever tool is standard at the company.
About three years ago I joined a company that was on Sketch after working at a Figma company. I thought I was pretty tool agnostic but after starting work, I quickly realized how awful the Sketch workflow is.
It's awful collaborating and sharing files with Abstract. More and more plugins were unmaintained. And with the growth of WebGL, Figma was actually far speedier than Sketch. Sure if you're 1-2 person shop or a really big company with lots of specialized Sketch plugins, Sketch might be fine but on any other team are better off making the switch.
It's funny, I also consider it a red flag if they're still using Sketch. However, personally, I still want Sketch to succeed and return to being a viable option
It depends on the context really. Sketch is still pretty common in iOS/macOS dev land, and I've seen it used pretty frequently in more "artistic" or experimental stuff, especially hybrid printed/web design projects. Its SVG exporter is also more capable than the one available in Figma.
It's also capable of pasting vector data from Adobe Illustrator, which makes it quite useful when pipelining web assets if you're dealing with vector art done by your art/design dept. or external artists.
It's clearly become a niche product, but it's still extremely useful for what it is.
Anyway, if I were interviewing a designer, I’d look at their portfolio and just ask if they’re comfortable using whatever tool is standard at the company.