Well, to be fair, you can only choose mode at start and probably most "player" don't want to pick easy mode because it's lame.
The game at start is pretty much easy until (I guess) you meet the Demihuman boss, however at this point you might feel: "I'm already come this far, I guess I should try harder to overcome this boss" instead restart and pick easy mode.
Then after defeat the Demihuman boss, it's take long way to reach the stomach worm boss, even though it's annoying but you don't want to restart anyway.
If you managed to defeat that worm, then other boss is jokers until you reach the Final Boss. Now you tell them: "Hey, stop complain, there is something called easy mode you know?"