This isn't a card game, it's a war. The Art of War says that you should leave an opening for enemies to escape through, so that you can control their movements and slaughter them at a lower cost to your own strength.
As an example: as sanctions force every necessary goods/components to move through one or two companies, the hand of the market dictates that those companies will be able to impose additional profits, thus making their competitors not competitive. But what if those chosen companies have poor innovation and weak results, yet are manipulated into market leaders by sanctions? You'd hurt the whole potential of the enemy industry.
And when later push comes to shove, you can close the lifeline and also sanction those companies. Or you can do worse. You can crush them with lawfare. They're non competitive, so they won't put up much of a fight. But your sanction has also turned them into the enemy national champion, so when you crush them, you completely crush the whole enemy industry.
FLG fried a lot of brains worldwide.