HTC, NOKIA, SAMSUNG, iPHONE - irremovable batteries, why?

It is mind-boggling that these new phones that are about to be released to the public (or have been released in some countries) have irremovable batteries. Perfect example is the Nokia Lumia 800.

Having a cell phone wherein you cannot replace the battery just in case the battery dies or gets over-charged or just simply reached its expiry, is a big turn-off for most consumers. We want cell phones wherein we have the battery replaced or up-graded when needed. This simply shows that we want our cell phones to last.

I have just learned that the new HTC Radar also has a irremovable battery. What gives? Are these cell phone makers into the "all profits" mode by giving inferior products? I would rather go with the older HTC Mozart that has a replaceable battery than the HTC Radar at this point.

Phones that have irreplaceable batteries become "disposable" phones simply because when the battery dies or expires, then your phone dies.

It is as simple as this, would you buy a car with a battery that is irremovable, irreplaceable and has an expiry date?