I don't use anything like a "writer deck" but for me pen and paper is a non-starter due to hand fatigue. I can type for much, much longer periods than I could ever hope to write by hand.
It also introduces significantly more lag, at least for me, between the thinking and actual writing down of the words.
Sometimes slowing down the process like this is helpful, in other cases it's better to make the emission of the words onto the page as immediate as possible, depends on the piece.
Costs about £5, lasts many months of heavy use -- much more than any cartridge pen as the whole barrel is full of ink -- and I have never ever had one leak in my bag or pocket.
Not the person you were replying to, but “oh, gee, I wish I’d thought of that! /s”.
I spent my first few decades trying to train myself not to write in a way that causes physical pain. The closest I got was when I discover Lamy Safari pens, which won’t let me hold them the “wrong” way. That only makes it a little less horrid.
Sometimes slowing down the process like this is helpful, in other cases it's better to make the emission of the words onto the page as immediate as possible, depends on the piece.