With so much note taking apps nowadays, I can't understand why does anyone still write notes with pen and paper. You need to bring the notepad, book or that paper to retrieve that information, and most of the time you don't have it in hand. While my phone almost always reachable and you carry when you go out. For those still like to do handwriting, there's many app does that and they can even convert it to text notes.
So, if you still write notes with pen and paper, why?
I’ll answer with a simple test. Do the following first on your phone and then on a piece of paper:
Design a thing, something physical; a box, a house, a chair, whatever. In addition to the diagram, this note must include a description of the item, the bill of materials, the dimensions and, if applicable, assembly instructions that you could confidently hand to someone else and have them follow. Ideally, you should include the dimensions of the object directly on the sketch itself.
Now give this to someone and see how accurately they can reproduce the item while you go off and make a phone call.
In addition, the mere act of giving that information to somebody else.
On a phone I can obviously text somebody, but what if I'm somewhere with bad signal (and yes, those places often exist), or the person doesn't have the phone in their pocket right that second (yes, this also happens in places with work where people don't want to risk the phone in their pocket breaking)?
With a mini notepad, I can rip a sheet of notes off and hand that diagram to somebody else. If it's work that will take some time doing while following a diagram, having a phone screen locking up because it isn't being touched is a hassle and going into the settings to change it back and forth is annoying.