Of the many ways business has changed since the dawn of the digital era, perhaps the most seismic is the "death of the end."
Here's what I mean.
When you grew up in print--which many people of my vintage did--there was a limit to how much copy an ad could handle. A page has finite dimensions. Unlike a website, it has an end. You had to learn to make every word count--because, simply, you didn't get many.
Likewise, content. When you had a prescribed and immutable time limit, you had to excise extraneous thoughts. You had a minute. Or 30 seconds. Not 3:16, or :47. Your time had an end. You had to finish.
Shooting on film also gave you limits. A "mag" lasted just about seven minutes and then the camera had to reload. And film was expensive. You couldn't just let the camera run through rehearsals. You had to find your shot and get it.
All these limits, all these endings demanded stern discipline.
They demanded an editor's eye at the outset.