How is consistency calculated, and why isn't the streak the main number?

Consistency = completed planned opportunities divided by planned opportunities, weighted 60% on the last 30 days and 40% on the last 90 days. Deliberate skips, pauses and vacation days don't count as missed; quotas such as “3× a week” count per week. There is a streak too, with an optional flex day per week, but it breaks on one busy day, which is why it isn't the focus.