Ahhh, Scrivener is fantastic! I've been waiting and waiting for Scrivener 3 to be released for Windows... and only discovered yesterday that it was finally released in March. Perfect timing. I like to do a lot of my writing at night and the bright glare of white is a pain sometimes. So grateful that they've included a dark mode in this latest version. 🙂
As for keeping every word I write... I just find it important to keep every little snippet of writing, no matter how tacky or terrible it might seem. There's every possibility it could be of use later on and part of me just doesn't like deleting things/throwing things away. I've published two books now and I have every version of them from the very first rough draft to each removed edit. It's messy. I read them sometimes and cringe, but they're my words and they should be kept.