In a liquid modern life there are no permanent bonds, and any that we take up for a time must be tied loosely so that they can be untied again, as quickly and as effortlessly as possible, when circumstances change - as they surely will in our liquid modern society, over and over again.
I think fun is an important part of the entertainment industry, and it should be. Anybody who's not incorporating some of that into their work needs to take a break, go away, and have an attitude adjustment.