I have been testing out this new video experience in SPO, Teams (private chat and channel), Yammer (storylines and yammer community).
I like the way videos can be easily uploaded and rendered and played. It would be easier for users to incorporate videos in services/apps ( SPO, Teams, Yammer, OneDrive). Videos get stored in different locations depending on apps like files. But for Storylines post it gets stored in OneDrive in a new doc library named VivaEngage and it’s not easy to get to that location in OneDrive. This needs to be clearly explained somewhere.
With this Stream on SharePoint, storage consumption for SPO will increase in many folds and Microsoft needs to allocate the original Stream storage allocation for Stream to SPO as mentioned above in another reply.
And, read somewhere that original Stream is going away, so with this the concept of one central location of corporate videos (corporate YouTube concept) is out the door.