The professional world is smaller than you think. A few years from now you may want a job with someone who works with someone who knows your old boss. They’ll ask for a reference because it’s so easy to find these connections in the era of LinkedIn. When someone leaves a company without notice, that tends to become the thing they’re remembered by. And it’s not a good look.
The risk of a rescinded offer is vanishingly small. Choosing to optimize to avoid that tiny risk in exchange for a near guarantee of damaging your reputation is not a good trade.
Huh? How do you control the workload of your team, especially as a departing IC?
Do you mean you're a manager who piles on the work then quits?
The workload is determined by the employer, not the workers.