Magic-tech industrialization wasn't something that happened overnight.
Even in a world like this, Ren's plan was to achieve basic industrialization in five years, then gradually complete and strengthen it afterward.
The priority for the Tulip Kingdom situation was stability for now, stockpiling as many troops as possible. If they really decided to go to war with that other world, then the first battle would be the decisive battle—they had to take it down overwhelmingly.
If they could use their world as a prison, they couldn't blame them for what they'd do.
And before that, there were actually some other hidden dangers in their world. If possible, they needed to find ways to deal with those too.
Like those ice spirits beyond the watch wall in the north!
Maybe they could use the ice spirits as a training ground.
Let them adapt to warfare with Magic Conductor equipment in advance.
