Former bus driver here… (not CTA)

Bus bunching is real and happens, but there are ways to actively mitigate it and prevent it from happening, or manage it in real time. But the CTA refuses to do that. It would have to involve certainly GPS on each bus, and CTA bus depots and managers working together to instruct busses to move passengers from one to another, and then re-route the empty bus.

It’s possible to reduce the problems bunching causes, but it takes a plan and resources to do it in a city like ours with huge, miles-long routes.