I think this is just a reflection of what is happening in every industry now ,mine included.
When I started in the construction industry ,more years ago than I would like to admit,the "site agent"(now known as a site manager)who was the main contractors representative on site,would always come from a trade background,i.e carpenter ,bricklayer ,plumber etc. Although there was some financial control by way of a quantity surveyor,these people would in no way tell the agent how to run the job.Nowadays a Q.S is by far and away the most powerful person in a building company as they control the purse strings and many members of senior management are drawn from their ranks.