Milwaukee does this, you get on the bus by when an app says it's gonna arrive around there. They also put express buses[1] on the busy routes which don't make the exact same stops. Two ways to split the difference on bunching I guess.

If you check out their site[2] you can click on the Route Map button and see the buses run in real time.

[1] https://urbanmilwaukee.com/2014/12/03/eyes-on-milwaukee-new-...

[2] https://www.ridemcts.com/routes-schedules/greenline