Great analogy, but this is a wheel you’re being charged for, after you’ve installed it on your product. Maybe you would have been better suited with your own wheel.
You’re not picking an existing good wheel solution that you can use forever, you basically took a promise for a free wheel that you’re now being charged for, and you’re sad because the free wheel isn’t free anymore. Well, maybe you should have picked an actually free wheel to begin with.
Unity is not the only solution to your cart problem. You’re just using it, because it is convenient.