When I only have a pen and paper (which I used extensively for writing at school), many things may be inconvenient, but there's no way to fix it. This may turn into a source of a low-key stress, and interfere with my writing much more than tweaking a computer would.
I use Emacs, an ultimate tweaker's tool, for writing every day. Last time I had to tweak something in it was a few weeks ago, and it took maybe 2-3 minutes. It's a small price to pay for a tool that just does what you need, when you need it, with zero mental load, and zero frustration.
For notes during study pen and paper are constraining and force me to organize the thoughts in my mind first and then commit them. Mistakes needing to be corrected here is good: It reminds me what I misunderstood.
But, like the sibling poster, the writing goes onto the computer for later editing.
It’s pretty much the single function of pen and paper.
Go Tim Ferris way - notebook where the first page is left for the table of contents, and number all even-numbered pages as first step.
But how do you archive these cards? That always drove me mad so I use them only for something “encyclopaedical” otherwise it is too much messy.
I am sure it is because I don't hold my pen/pencil correctly, but I think after 43 years I am not going to suddenly fix that.
Use a fountain pen. You can't press too hard: it bends and breaks the nib.
Disposable ones are good enough now, e.g. the Pilot V-Pen.
https://cultpens.com/products/pilot-vpen-v4-disposable-fount...
Fountain pens are nice too since you don't need any pressure.
My writing looks a lot better if I just force myself to slow down and be deliberate, but honestly it's a constant battle. I'd definitely benefit from practicing penmanship on it's own.
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I've had many writing classes in school and different holders for the pen etc but I never managed to improve at all. Writing is just not for everyone.