There are more than enough conceivable use cases.
Let’s imagine you’re a technician. A complex process regularly gets in the way of your daily work. By chance, you have now come across an opportunity to bypass or optimize exactly this step.
You want to communicate this workaround to your colleagues so that they can also operate more efficiently. What do you do?
Do you tell a few colleagues in the hope that they will also share the knowledge?
Or do you keep your best practice tightly under wraps because you know that it wouldn’t be introduced anyway?
Instead of these things, you shoot a video showing how you work around the problem. You share it on Microsoft Stream so that all your colleagues can watch your solution. Then you use the survey function (Forms for Stream) to solicit ideas on how the practical idea can be improved.
I definitely advocate answer 3!