Creative endeavour is transient. A movie, a series, an event, an album. The work may come in waves but the high, fixed, cost of specialist facilities is constant.
Building or acquiring additional facilities to accommodate peaks in demand is seldom a viable option, always expensive and never quick.
Meanwhile, the creative industries continue to decentralise as more and more can be done in locations outside the traditional hubs. Home studio builds are a costly undertaking, requiring extensive project management and bought-in expertise. What happens when you move house?