Timetables, at the end of the day, are addressing an every shrinking percentage of ridership for any mode of transport be it bus, train or (long since gone) airplane.
Online booking tools via proprietary websites (e.g, Amtrak), or via third party aggregators or OTAs drive the bulk of booking activity along with search and explore visits. Why? Because these tools can provide multiple modes between locations and offer additional services and attributes that may be purchasable.
As for your “vapor bus” between Ithaca and Syracuse and your assertion that it’s “unfindable”… a 5 second google search for “Ithaca to Syracuse bus” provided a wide range of links to various sources of that information. Let’s look at
www.wanderu.com
as the source, for example. Not only does it show the nonstop bus at mid-day, but it also provides multiple connecting itineraries.
Now, let’s extend this to a rail perspective given this is Amtraktrains.com and not buses.com. For example, NOL-ATL On July 14. Well, wanderu provides a range of options for me - how convenient. It lists:
Amtrak listed first (which tells me they are buying an elevated display from Wanderu)
Greyhound - three buses At 9:15AM, 12:55PM and 9:00PM.
Let’s look at another example quickly - Atlanta to WAS on 7/14. The result is dozens of options - multiple bus lines of various flavors from Greyhound through to ”Chinatown bus” operators. Wanderu also develops connections that maximize connectivity. How so? Well, it provides a connecting itinerary of Southeastern Stages Atlanta-Florence SC, connecting to The Palmetto. Now, is this a guaranteed connection like a Thruway service? No. But the point to be illustrated here is that OTAs like Wanderu are how surface transit is being booked today and will continue in the future.