Stride tutorial - Action vs NLA??

I’ve just completed Gimble’s stride tutorial (thank you, thank you, thank you!)

and have a question…

To get the animation to run properly it is necessary to have the NLA playback option selected in the Action window as shown in this image

If I switch the playback option to “Action”, the cycle animates fine but the stride seems to be ignored so the feet slip and slide as he walks. Is this how it’s supposed to respond? It seems that it would make it difficult to test a single walk action in a complex animation scene with multiple actions in the NLA since the “NLA” option plays combined actions.

Maybe it’s not really a problem?