It's not that Gensokyo's technology is primitive, it's that it's all over the place so you can't exactly peg it down. So the default understanding is rudimentary.
Advanced Technology is held by a small number of youkai elites, who either hoard it for themselves or sell it to the common man at a premium. Wake up sheeple, rise up.
GIOGIO 5There are many kinds of Stand powers. My comrades possess powers like zipper, planeWhat's with this fucked up tech-tree...Giant robotNuclear powerRocketUFOMy mistake. I tend to forgot that Gensoukyo's technology advancement is relatively primitive. What kind of high-tech creation do you have here? Pistol?Playback recorder?Flying chicken?
A pun on the Chinese pronunciation of "plane" and "flying chicken" being the same, despite using different characters.
Zipper?pistol, playback recorder