Increasing the available range of shot lengths from 10 seconds to 15 seconds gives film makers a wider pallet of options, if the longer shots have continuity, which is the other claim here.
I'm not aware of any "one-shot", one and done, use cases that are much more compelling the clip is 15s vs 10s. But that's not relevant to many people actually using AI video models like this on a daily basis.
For B-Roll it's different. I can somewhat see the why behind that. It's just to give your brain something to look at so that you don't have a voice-only podcast.
But movies OTOH are these creative endeavors where the shots _are_ the content instead of just augmenting the content.
This won't stop the industry from still trying to use this tech like that, of course.
I mean, if you just want to claim that AI lacks soul, and its an abomination if every frame in film isn't make by a chemical process involving silver nitrate, like the good Lord intended, that's fine. But there are certainly film makers who don't share that sentiment.
I would rather expect people to use AI to drive more conventional VFX tools, as that is reproducible, can be versioned, and, most importantly, will contain true intent in aspects.
Something this simply cannot do.