> More and more PC laptops are moving to the same model. There are a lot of benefits for the manufacturer. Fewer parts (less $ to make), less to break (less support $), can make the laptop thinner and lighter (so you can charge more $), the battery no longer has to be a easy to use shape (have you seen Apple's tapered layers of thin batteries?), extra engineering costs, etc.
Conveniently, built-in batteries also harm the resale value of a used device.
Conveniently, built-in batteries also harm the resale value of a used device.