I watch it. Also it's a wholly generic, rather bad series.

Agreed, the isekai premise is so unneeded. Nothing would change if he didn't come from our world. Reminds me of that other anime where someone was reborn as a silver-haired boy in a fantasy world and started designing mecha for the kingdom. At least there it was the reason for his different mecha designs, because he used to be a gundam fan in the real world.