And so what? Did you write &quot;HTML&#x2F;CSS is mandatory&quot; in the job description?<p>As a developer I have grown a tough skin to managers that keep complaining that &quot;these JS&#x2F;Python kids today don&#x27;t know anything about register allocation and data segments in assembly!&quot;<p>Workers unable to fully understand your technology stack is an universal problem, goes far beyond computers and web. There are only 2 options for you to deal with it:<p>1. The Silicon Valley approach: pay top dollars to whoever knows the technology you want.<p>2. The German Mittelstand approach: nurture, train and develop your own experts. Make deals with technical schools, offer a viable career path to young students and help them learn.