As a counterpoint, having a broad range of skills and experiences has been hugely important for me and my employer, and hasn't limited my career or compensation

As a counterpoint, having a broad range of skills and experiences has been hugely important for me and my employer, and hasn't limited my career or compensation. I fill in the gaps where I'm needed, and it's up to me to create visibility and take on projects that look good on my resume. Naturally I tend to go deep wherever I end up at a startup (so I have specialized experienced that helps my career), and my breadth allows me understand the entirety of the stack and design systems better than someone who only knows one part of the stack. At startups you really want someone who can jump into any part of the technical work and ship quickly.