Stellaris is by no means a “create everything” game, but to me, changing the spaceship loadouts is a chore I leave to the “automatic optimize” setting. If I had to design something every time I invented a new technology, that would break the flow of the game and be quite unfun.
I believe that manmade objects should be generated procedurally from premade parts - for example, researching “pottery” would add urns of many shapes and sizes to your settlements. The appearance would be determined by cultural factors : the dyes and materials available, and the designs that are present in your culture. Martial cultures may choose to customize their weapons with engravings and paint, while more ultilitarian/brutalist cultures might not even embellish their dining-vessels.
That way, tech designs are made in a broader and AI-friendly sense, rather than making them individually.
Vehicles will probably be the biggest draw of the tech editor, as well as wacky inventions : a cup-axe, where you can split logs and contain your possessions at one time.
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