Can I ask, do you find that the benefits that other respondents are claiming (maybe younger respondents) are artifacts of a wishful thinking? Is it possible that the benefits are somewhat real, but come with downsides? I'm not leading in any one direction, but I am curious if the experience is more objective or subjective.
I'm not younger and listened to records and used a typewriter. I have a typewriter because it creates an environment that is not a computer. Unlike a phonograph, a typewriter is an entire ecosystem less commodity supplies (a phonograph is useless without the activity selecting and acquiring and storing records).
I don't recommend getting a typewriter. If someone wants to try one, they will do it. And if someone doesn't they won't. They are not for everyone and there is no moral distinction between those two groups.
Could be a couple things:
1. ASMR. Typewriters make a nice sound as you type. A lot of people like it. With regards to vinyl LPs, while growing up a friend of mine always remarked how much the static reminded him of a crackling fire. He felt like you were listening to music beside a fire.
2. I grew up in a time when these were simply the tools we had. I'd already learned how to be mindful about doing work - the tools forced us! I learned how to write and compose without the benefit of a computer. I learned photography at a time when I processed my own film and made my own prints in a darkroom. I know that experience has greatly affected how I approach digital photography. Younger people might simply be getting a thrill learning what I learned decades ago. Maybe they appreciate a completely different approach to achieving the same thing? With an entirely different workflow? That might give them new insights.
There are still aspects of the old that I like and prefer. For example, I still prefer books over screens. I still write notes on pen and paper and later transcribe them to my computer because I've learned I'll retain the information better if I actually physically write it down. When recording music, I prefer to use Audacity because it's like using the computer as a giant R2R and I get a more natural sound. I still shoot digital cameras in manual mode (or semi-automatic depending on the situation) because I like to control the different technical aspects of the shot. Stuff like that.