Improving a security posture doesn't just improve security; it also enables more things to become viable.
That's the real reason improving security is worth it.
It's not "what you had before, but more secure," it's "for the same security posture, how much more can you do."
As you make it safer, what people try to do will extend further than it did before, and reach a new equilibrium where more is possible.
Improving security reduces friction.
Security sets the friction of distribution in an ecosystem.