There will be a Time when you Will need the Bomber Starship Over the Siege
There Will
Just think , You can't Have a Bulky Siege in a Speed Invasion , Nor can you Use it to Chase Dreadnoughts Who can Simply Bombard your Slow Siege And Simply Move Away once you get in range , in those Situations , It's When you Call in the Bomber Starship
Besides , Sieges Don't Stand a Chance against ANYTHING that Outranges it , It'll Get Destroyed before it Even Manages to Fire off a Shot , If it EVEN manages to get into Range