Hello. Just back from AKL so will share my experiences.
Stayed at Jambo and each morning it had its own dedicated bus to the parks, I went in for early entry each morning and the buses never left with seats unavailable. When returning to the park the buses were shared and always stopped at Kidani first and Jambo second. Longest wait was about 10 minutes leaving MK around 2300, everyone boarded the bus. Otherwise all waits were less than 10 minutes and again I never saw anyone left behind. This included leaving DHS after Fantasmic.
I saw the internal shuttle running but personally always walk in between, one evening I walked Kidani to Jambo (as their were 2 EVCs to offload) and at a good pace I got to Jambo in 7 minutes, the path was well sign posted and lit. There is a sign at the Jambo bus stop saying take the Disney Springs bus if you want to get Kidani, I assume this is for people who don't know about the internal shuttle and get to the bus stop wondering how to get to Kidani.
The Bus Times section on the app (for departures from Jambo) was far more reliable than when I stayed at Kidani February 2022, I think this is because the system is more accurate than it used to be as opposed to any difference between Jambo and Kidnai. I would say arrive 5 minutes before the posted time as if the bus is ready it tended to leave slightly early from my experience.
I know many people dismiss AKL for being too far out of the way but the bus system for the resort is reliable and with the exception of MK the journeys are short. AK is a matter of minutes and I don't think Epcot or DHS are more than 10 minutes. I think some of the road improvements that were made around the time of Galaxy's Edge opening have helped these routes compared to the past. Even the MK journey felt pretty smooth and whilst i wasn't paying too much attention assume it takes advantage of some of the new flyovers. Personally I think AKL is better than the resorts with the multi-stop bus loops or having to wait for a boat or transferring to the Epcot line.
If anyone has any questions just reply and I'll do my best to answer them.