I think there could be a simple explanation. There is no "booming jobs". It's an illusion. Employers just decide that they don't mind to advertise some jobs, in hopes that a cheap labor will come and they'll "optimize" their process. In fact, if nobody will come, employers will go just fine, but just in case somebody will, they keep doors open. This keeping the door open costs comparatively little, especially given the alternatives (when everybody else does the same). So, we do see some wage increases, above inflation, but only when it's really, positively critical - which in fact in many cases today is not. So - no real need, no wage increases.