- Location
- Potato land
Apparently Summon Scrolls are complexly interlinked composites of literal hundreds of sub-seals. They're by far the most complex thing ever devised in the setting that we're aware of, and far more complex than any other seal. A fair number of people in canon believe that all the rest of sealing was learned by studying them, which suggests they existed before humans knew any sealing. That's why the leading contenders for how they came to exist are aliens or time travel.
In short, it would be nice but humanity doesn't have the sealing knowledge yet. If we build a university system and robust scientific process maybe we'll get there eventually in decades or centuries.
The "Summon Scrolls are really complex seals" theory comes from Jiraiya exclusively, I'd like to note. Kagome, also an expert sealmaster, had a very different take on it. I'd caution against making far-reaching assumptions here, as we have very little information to go on when it comes to Summon Scroll nature and origins.