Well,
That Wacom Bamboo stylus is just a commonplace, purchase anywhere, “dumb”, simple capacitive stylus with NO electronics inside.
That is why that type of stylus can have a ballpoint pen and ink barrel built inside of such a stylus.
Most found everywhere, “dumb”, capacitive stylii are hollow and made of electrical conducting aluminium to conduct electricity from your body/fingers, through the stylus barrel, to the conductive tip, which works essentially the same way your bare finger works on an iOS device’s screen.
Adonit has something that is similar to that, as well.
A smart, Bluetooth stylus is something completely different and has all sorts of electronics that fill the inside cavity of the stylus that sense surface pressure and angle and speed/velocity of the movements of the stylus, has battery and charging circuitry to regulate charging and circuitry for the Lightnng connector.
You are comparing two different types of stylii.
A “dumb”, unpowered, unprogrammed stylus VS a “smart”, Bluetooth operated and logic board programmed and operated stylus.
Two different types of stylus technologies.