Because doing a surgical strike with Assault Transports and cloaked Warheads on an AI Homeworld doesn't look cool.
Actually I'm far more interested in stuff like that than "how many explosions can I cram onto one screen?", though I'll take the latter if that's what the submitting player finds most interesting at the time.
Some brief description to go along with the action is fine, and I think is helpful if it helps point out what sets AIW apart.
One potential "theme" for the trailer that comes to mind is a series of clips from a war journal or whatever. Like:
(Intro with text fading in, black background)
We fought each other.
We built the AI to fight for us.
The AI fought, yes, but against us.
The AI Won.
(Shot of zooming in on home command station) 0:00:00 We barely escaped. We may be the only survivors.
(Shot of human attack on adjacent planet) 0:02:11 The AI was distracted. We struck back.
(Shot of one of the first few waves attacking the humans) 0:09:28 We survived the response. We grew bolder.
I don't have time to flesh it out very much right now, but following that up with:
- a few time-lapse shots of the galaxy map as human territory grows
- an assault on a fairly beefy ARS planet, with a quick text-line and shot for each "layer" of defense the player had to deal with. Smashing the Ions/Mass-Drivers, sending the right ships after each guard post, unable to bring in the whole fleet due to the eye, temporarily retreating in the face of the special forces arriving, then the actual capture.
- a defense against a cpa and/or multipart exo, with a few quick text-lines highlighting what's going on; some on the galaxy map showing the different directions the AI is coming from. It'd be cool if the AI overran some planets before being stopped.
- more time-lapse galaxy map territory growth
- a hack on an Advanced Factory, again with a quick-text-line and shot for each interesting part of the planet being dismantled, and warheading the special forces when they show up
- possibly another big AI attack
- more time-lapse galaxy map territory growth
- an AI HW assault, highlighting the clever/brutal stuff on either side
We'd probably have to prune out some things to make it fit in a reasonable length, but the shot changes would be fairly quick so quite a few could fit in.
Anyway, something like sounds like it could work, but it's not the only way it could be done.