[nabla9]

All low caps is faster if you need to write as fast as possible. Think news wire people reporting news like "three shots were fired at president kennedy's motorcade in downdown dallas". The old teletype machines had only one case anyway.

[gerdesj]

I'm 53. Morse and teletype were both well before my time - I did not have to engage with either directly. I recall that a "wire" was sent in all uppercase, with STOP for full stop/period.

My mother used a manual typewriter and then later golf ball etc. I did too. She and I were virtually incapable of not using shift. Smacking physical keys is rather satisfying and you tend to pause first before hitting them. Its a very different discipline to modern word processing. Worrying about case will come very low down the pecking order compared to speling (lol).