Exactly. When I had some sticky keys on a 2015 MacBook Pro, the Genius told me that the only way to fix that was to replace the whole top case and it wouldn't have been cheap. I just went home, searched a bit on YouTube, removed the keycaps and cleaned them. It's the same for batteries: they want you to replace the whole top case for a stupid battery that they could have made much easier to remove (it's still possible to do it BTW)