Underground roads are crazy expensive. You need something to hold up the earth and anything else above it. There's issues with water leaking in. Piping will have to go around it. If it breaks down somehow it will take longer to repair. It's only really an option if the detour would be a lot longer or within urban areas for the extra space it frees up.
That is usually to avoid bots. Any normal person can easily get a couple hundred karma by just posting a bit or commenting a few times, but any bot doing the same is gonna undergo scrutiny.
Ys 1 was pretty fun and short. It uses bump mechanics for combat which was fun. The final dungeon is like half the game and you are already max level when you enter so the challenge was pretty good. The random lore snippets gave me a sense of wonder the whole game. Ys 2 was more complex in its mechanics and it seemed to randomly get super hard so I gave up on that one.
Why? Are you feeling bad about all the adware you bundled in?