Other things that send signals, include the way you dress (don't have to wear a tux everywhere you go, but wear clothes that fit, and have a sturdy look to them). Also it is helpful to work on your speaking skills, so that you speak with inflection and purpose. For example, listen to the difference between a radio host, and call in listeners.
To go a bit more meta, the question is, who are you? Who do you want to be? Who do you want people to perceive you as?
Using a fountain pen hits all the highlights to these questions.
Besides, it's just plain old COOL to be using a writing technology that is over 200 years old. The quality pens feel amazing, and encourage additional note taking for me.
Another advantage to paper notes: They arent searchable. Yup you heard me, NOT SEARCHABLE. Oh wait, you say, I want to search my notes... so I put everything in email. Then I get fired. And my boss owns my private notes. Oops.
And my hands start to ache if I use a ballpoint too long. Ever tried taking 5 hours of notes at a math conference with a crappy ballpoint? And live-texing is fine until you've got more pictures than text...
I think the parent you your post is a very valid criticism when paired with this sibling: https://news.ycombinator.com/item?id=6407094
And what is this "major signal" that it sends to others? That you're out of touch? That your pens cost more money? That you're pretentious?