I say incentives in regards to policy, the policy realities govern what constraints you're willing to work with. For example, in NL our policy is that by 2030 every public transport vehicle just be zero emissions. From 2025, no public transport vehicle can be purchased that is not zero emissions. Additionally, we have concessions, so anyone wishing to win these concessions must have an aggressive plan to meet those policy goals or risk losing the concession bid to another vendor. Vendors also generally buy the vehicles, so there is an incentive for them to make the most efficient plan possible.
In the USA, the agencies are mostly a public entity that will exist whether or not a policy goal is met. So there's no forces pushing for improvement. Especially logistically. For example, much of the conversation in the USA about electric buses is about the wish they'd have the same range as a diesel bus. There is no effort here to consider that the way driver and bus interact in their duties might need to change in order to make the range (opportunity charging) work for a full-time shift.
It is true that OTS has Hastus, but just because you have the keys to a Ferrari doesn't mean you can drive it! if you take some time to look at the timetables for TheBus, you'll see they're all over the place. There's a policy failure here to coordinate service, and perhaps skill as well.