Adding a feature to a site requires some investigation into community interest and to use cases. Here's a successful example. In that case the feature was MathJax and the issue was load time and server overhead or something to that effect. It took about 16 months!
I'm wondering if there is interest in adding the ability to view in-line YouTube videos to posts here in Astronomy SE? There is a certain level of parity between Space SE and Astronomy SE and I'm always surprised when embedded videos show there but don't show here. Latest example, probably not the best use case though
I'm curious if there is any interest in looking into adding the YouTube viewer here. Since it seems it can take a long time to do this, consider that we're talking about how we envision the future of the site and the field of Astronomy, and the astronomical data and content available in the future, and not only experience in the past.