Nothing is out of date in the world of technology. Whatever is sent out eventually returns in another form.
This rite of passage is fascinating. Consider cylindrical-shaped batteries as an example. They were replaced by ones with a rectangular shape a few years ago.
They were also known as bag batteries and prismatic batteries. Particularly quickly adapted were notebooks and mobile devices.
However, Tesla, a type of disruptor in the EV market, chose to veer off the traditional road. The Elon Musk-led business decided to pursue cylindrical battery packs.