This is something that Cerny acknowledged as a weakness of the DS4, yet they keep doing it. I get the base controller, it has to be bundled with all ps5 units, but a pro 200$ controller, you kind of expect to have some real QoL benefits.They were definitely in a tough spot with the design. If they wanted to keep the same form factor, something had to give. And unfortunately its the battery size.
Can't say if it was the right decision as the 4-5 hour battery life seems to be one of the common negatives in almost all the reviews.