As sibling mentions, the problem isn't that they made a new settings panel, it's that the new settings panel is both slower and less functional than the old ones!
This isn't unique to Windows. It's a general problem. When something like network configuration or screen resolution had been a pretty stagnant thing for 20 years, you could just leave it alone or... spruce it up. Sure, it's always possible that there are better ideas. But implementing a change because you have a better idea is one thing. Implementing a change to justify your salary is another thing.