There are lots of stories about writers who are very productive using an old method: --This dune story, --Game of thrones (asoif) written on wordstar --And of course dozens of writers who still use pen and paper This is what these environments have in common: no or minimal internet to distract you
The temptation to go back and tweak what you've written is fairly strong with modern tools. An author can waste hours, an entire writing session, on rereading what they wrote and making adjustments. That's an activity best left to after you have a completed draft in hand.