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).