What exactly does Matahachi mean here at the end?

I understand that the first panel if reffering to what the manga is all about with become stronger and the question of if that's really what strength is all about (my loose and short explanation of it). But it's this last part that I don't entirely understand about all they're really cutting is the grass to make roads. I'm assuming it's metaphorical, but I don't really understand what it's a metaphor for?

I understand that the first panel if reffering to what the manga is all about with become stronger and the question of if that's really what strength is all about (my loose and short explanation of it). But it's this last part that I don't entirely understand about all they're really cutting is the grass to make roads. I'm assuming it's metaphorical, but I don't really understand what it's a metaphor for?