It came to my attention that certain YouTube videos embedded in posts here were NOT playable on Apple devices, and would just show up as blank space.
I looked into it, and I figured out that it had to do with a mod I installed, which auto-converts YouTube URLs into embedded videos, without having to use the [video] tag.
Unfortunately, that mod was breaking things, I think due to some changes YouTube made in its own embedding code.
Anyway, I fixed it tonight.
Now you can post YouTube with or without a [video] tag. Just post the URL, and it should work on all devices.
The first example is below -- simply posting the URL:
https://www.youtube.com/watch?v=jNGZo5gn_tc
... should show the video below: