Where I lived recently the interval at peak is like 4 min most. One stop boarding can take 3 min when stop is full. My bus skipped my stop until 9am because bus after bus are full. Skipping stops is one way to reduce bunching I guess

EDIT Who said there's only buses? There are cars, taxies and subway

It's always possible to add more buses or people can just go queue at the previous bigger stop it's 2 min walk away and it always stops there.

The point is that crowds cause bunching. I don't know what is your point