This is a combination of thoughts rolled into one.
First is a topic I made a while ago about
making Mordor a shooty army, whether something that generally lacks firepower can be used to generate ranged supremacy. I think it's possible, but more likely is the current accepted use for archery, which is that it scares people.
Second, I was experimenting with an army for a pre covid tournament. Basically a giant shieldwall with monsters, nothing out of the ordinary for me. I thought about it and decided that the army is really lacking something. It can deal with any combat threats comfortably, but any army with shooting would control the game. So I added a Catapult as a way of saying "you want to sit back? Go ahead".
Now I'm thinking about it, is this the role of siege weapons in non siege games? Archers won't make their points back by shooting, but they give you a bit of a psychological edge. Siege engines are even more extreme both ways. Sometimes they kill your models because of how the scatter works itself out, and they'll rarely make their points back, but in an army that doesn't want to chase I feel like they can help you play the game on your terms much more.
What armies would you plug a siege weapon in? Siege Bows and Ballistae are always cheaper than getting a separate warband's worth of archers. Catapults are more expensive than an archer-filled warband, Trebuchets are still cheaper. Do you use it to give yourself some kind of ranged threat in an otherwise combat army? Do you use it to really clamp down your status as the dominant ranged army?
The one army I was never able to beat, must have been 12 years ago now. He used Wildmen of Druadan for the bulk of his army. Once you get within 12", you're facing 40ish blowpipe shots that tended to end the game in a turn. To discourage people from hanging back, he had a Trebuchet that never actually did anything, it just looked big and imposing. The Trebuchet's only job was to bring your army to within blowpipe range of the Wildmen.
So yeah, thoughts on siege weapons? When do you use them? I can list the army that got me thinking seriously about this if anyone's interested.