I know, and that my point.
The fact that doing farming activities is a slower route than managing the spreadsheet indicates that the spreadsheet is the intended and expected way of approaching the content, and if you don't want to engage with it then you have to settle for a slower way of earning cowries.
Also, even if you don't want to engage with it, your entire island is still structured around it. You can leave the workshops idle but they're still there clanking away and being the core feature of your hideaway.