You're not required to buy the $1500 license unless your company has already made $200k. If your first game goes bonkers and sells $1 million on the free version, you do not have to pay $1500 for the Plus version unless you make DLC or a new game after your bonanza. The license is prospective, not retrospective.

Other than that, you've just restated what I already said. Unity provides the tools on subscription, but does not charge a royalty anymore.