Not really an oversight, the assumption being: planet unlocks after the foundry and electromagnetic plants, at this point in the game, you should have automatic space routes set-up, so bringing a foundry and a plant isn't crazy. Also, I lay out the whole production loop on the mod page.
But I don't think it's inherently a bad idea, I'm pondering it, and added a poll to the discord to gauge whether it's a good idea or not to add a foundry recipe.