Good quality L zooms have been gods gift to busy photographers working in dynamic environments where a lens change may mean lost shots, a barely perceptible improvement or a dirty sensor. I wouldn't mind betting that by far the greater percentage of reproduced images both commercial & editorial are shot with zooms by very satisfied photographers for very satisfied clients.
Other than when I need 300 f/2.8 or 400 f/2.8 I'll be using zooms. About the only time I'll reach for a short prime is when I am after a specific look that f/1.4 or f/1.8 may deliver, or when I'm battling against the light and am reluctant to go higher on the iso, usually because of personal & client expectations for IQ.
There are good, valid reasons for shooting with zooms or primes, but I think the zoom/prime debate has skewed way out of balance towards L primes being perceived as some sort of holy grail. But unless you are making good money from your photography, there is scant justification for spending up big on expensive, comparatively limited primes. Few viewers are going to swoon over the quality of the bokeh, what turns people on are powerful, gutsy images that COMMUNICATE. As my first picture editor kept reminding us, content is king.