I’m amazed how many people leave on bad terms. Over any medium and long term time horizon it’s a terrible strategy. You never know who will do a quiet back channel reference, and many times we wind up working for the same people.

The other piece of advice about documentation is important beyond leaving for a new job. Many people lose promotions because “who could possibly backfill them?” Creating a high talent well documented organization is a great signal for promotion readiness, and takes a roadblock away from it too.

Yes it's crazy.

There's the founders podcast about Elon Musk. Apparently he stayed in good contact with the Paypal people, even though they fired him and later on that relationship saved Spacex.