Sounds like a desperate attempt to convince investors that there is growing user engagement by decreasing the amount of time needed for a video to be considered engaging. Must be that people are moving through shorts at breakneck speeds. I haven’t touched YouTube in many years as the platform turned into one giant ad service (even if you pay for to remove ads). I guess that is what Google is primarily anyway, a company aiming to serve personalized (maybe also behavioral) ad to people.