Interestingly, if you can demonstrate that your keyboard has gone to shit and they thus have to do a top-panel replacement, they have to replace the battery, too.

At least that's what they did with my new Macbook Pro when a few of the keys came off with my fingers as I typed because I thought I could power through the crunches of debris that got under them.

Possibly the one (cheeky) advantage of a hard to replace battery: free battery replacement when something else fails. :)