Typewriting was an skill in the XX century. In order to reach high words/min, you need to develop memory muscle and avoid typing errors. Those days, a single t

Typewriting was an skill in the XX century. In order to reach high words/min, you need to develop memory muscle and avoid typing errors. Those days, a single typing error means repeat a full page. With modern word processor that have disappear. It was common to have two or more caps in a row. There are two shift. They were designed to use with the opposite hand to the key being type. So only one finger in each hand is pressing the keyboard, that applies to uppercase and special characters. Fast typing means you avoid errors and balance the hands. For uppercase/special chars you need both hands, one pressing the shift, the other pressing the key. When there were two or more characters, the operator switch to caps, it was easier, faster. The memory muscle was developed. Back in the days, mechanical machines don't have italics, only one font, and bold was tricky in some machines. This applies also for Selectric, nobody changed the ball in the middle on a text. So uppercase was used for emphasis. That's how a trained professional used caps lock 40 years ago. Currently, it depends on your text input.