What is Tech Stacking in Property Management?

Will Alexander and Harrison Vaughan bring up the topic of 'Tech Stacking' whilst David Faulkner, who is starting to show his age, has no idea what 'Tech Stacking' is. Anyway, once the conversation flows, David actually does know a thing or two about it as the boys discuss the importance of 'PropTech', how it should be used to increase productivity and how much is too much.