This hasn't been my experience at all. People are building increasingly complicated apps like Figma in the browser and are happy to hire senior developers and pay them well. If anything I see the number of back end roles diminishing as people increasingly delegate that stuff to various cloud services.
Figma has been great new thing that simply did not exist ten year ago. I know a co-founder of a competitor to Figma called fluid UI. That was working on that around that time. Shiny new stuff in other words.
