Likely they will add more POIs as the game progresses. As well as the more exploration that will be needed with future biomes and bosses.
Also a lot of people already use Map reveal sites to skip hunting for bosses, the trader, and anything else because they complain exploring it too time consuming (then complain the game is too short). So you can't make everyone happy.
It's a lot like Minecraft, some people enjoy exploring just to find neat vistas and such, and some need more motivation.