Drops and step-downs are fundamental trail features with real consequence. To handle them sensibly, the focus should be on body position and landing preparation before ever looking for a bigger feature. Mastering the weight transfer and ensuring you aren't just falling off the edge is the only way to maintain control on the landing.
Progression judgement is about knowing when you can consistently nail the basics at a smaller size before moving up. If you are fighting the bike or landing haphazardly, you haven't mastered that level yet. The goal is to keep the bike level and the momentum moving forward without losing your line.
What specific markers do you use to decide when a drop size is officially mastered and you are ready to move to something larger?