You just order a new key, and install it. And not have the downtime. (You can remap key or use an external keyboard.)

And yeah, replacing the battery is easy. Not a Framework, but I replaced a laptop battery some years ago, was glad I had that option, because lithium battery lifetime always decreases eventually.

I’m old enough to remember when many phones and some laptops had removable batteries. Switch to a spare, and boom instantly full, you didn’t need to tether it to a wall.