Same goes for phone batteries. I see no technical reason why they can't make batteries easily removable anymore. They say it's because it helps to make these modern slim computers even slimmer, but I don't see how that actually relates to it at all. I've always figured though it was so they could get more money from the customer, by charging them twice (or more) for the same computer. First the sale of the computer, and then any battery replacement. It's just a get quick money scheme for the company.
But what if it was more than just that? What if it had something to do with fighting crime? Criminals these days have gotten really smart. Thanks to mistakes made by criminals in the past, and thanks to various news reports you can read online about how various criminals got caught in the past (as well as sometimes leaks that result in tech articles on tech websites actually explaining how certain forensic techniques actually work), modern computer criminals have learned a LOT about how to protect themselves. This includes all kinds of things like using strong passwords on everything, using VPN, encrypting their files, etc.
One thing it seems criminals learned was that a computer or phone that you powered down from a menu option in the Windows start menu (or equivalent action for a cellphone) isn't actually shut down. It's simply put into a very low power mode in which even the OS isn't running, but it's not completely shut down. This means RAM memory is maintained in a powered on state so the physical RAM chips still store data from what you did while actually using the device, and some things I've read indicate that possibly even the GPS mode is enabled when the phone is supposedly powered down so it can still be tracked. As a result smart criminals started to remove the batteries from their phones when not in use. This keeps the GPS (in phones) from tracking them, and in about a minute (possibly less) the binary state of the transistors in the RAM chips is completely reset to 0, so no usable data left for the authorities to see what you had been doing on the computer.
As a result, civic minded computer and phone companies realized this was a problem so they started making it harder for badguys to power down their devices so as to make it easier for law enforcement to catch badguys. Or possibly, law enforcement realized it first and went to computer and phone companies and asked (or even demanded, under threat of prosecution for the crime of "obstruction") that these companies change their hardware to make it harder for badguys to hide their crimes by simply removing the battery from their device.