> Media is also far less complex. How do I know if my video is correct? I simply play it. If there any errors, they are all possible to detect in the minutes it takes to play the video.

There's actually a level of complexity to video well beyond what you imply. For example, making sure the colours appear the same when you watch something on your laptop screen and when you watch it in the cinema requires a lot of care and attention - and no small amount of science. Also not all video edits are realtime - some things require a lot of processing, which can take just as much time as compiling a decent sized app.