Maybe Jii-san was the reason why other isekai or the same isekai world, in future time frame was so civilized for the future isekai'd person, by giving out technology techniques here and there....
Sap has been used historical as a binding agent. The only reason some things are not used, is if the technology to get it or used it hasn't been invented.
but the author need another stupid plotline so they could show off the pokemon style cartoon villains again. /s
Yeah. It's about as annoying as the cooking trend in some these toons. "OMG! We never taught to think of using spices, salts, or even draining the blood of animals before cooking it! You are a genius! Oh no! The sole reason everyone gets sick after eating meat is because we never cleaned the meat before you the modern person from Japan showed us! OMG! we can drink milk from animals??"
@pandatime It's not so much a lawsuit by current methods, but if the guild determines that the MC illegally interfered with their work he would be forced to recompense them.