There is a slight difference here though. With Roaming Assistant turned off it is your device that is doing the switching between the nodes. Some devices handle it better than others. I would suspect if you had an iOS device you wouldn't see the switch happening as they tend to stick to their connected node longer even if there is a node with stronger signal available. This is where Aimesh and roaming assist is beneficial as it will detect the signal strength of the client connection and handle transitioning the client before the client may have done it on its own.
I concur that my device is likely doing the switching, but when one signal is at -68db and the mesh node is at -35 db, it's highly unlikely that my device is going to switch back to the weaker signal. Something is triggering the mesh node to kick my device off after my phone connects to it.