That qualifies as significant value for the consumer - making the device notably (relatively to the price of the rest of its parts) cheaper to produce and easie

That qualifies as significant value for the consumer - making the device notably (relatively to the price of the rest of its parts) cheaper to produce and easier to repair. In just so many cases using a proprietary DC jack (like in my Dell laptop) decreases the value by forcing you to carry around your PSU wherever you go and buying overpriced replacements every now and then. The same applies to batteries - having a single (or some) standard for easily replaceable Li-Ion blocks would increase the value a lot.