easability - When you're like, 'Oh, this is just that easy, why didn't I

When you're like, 'Oh, this is just that easy, why didn't I think of it sooner?'

This game was just that easy, I was like, 'Why didn't I beat this level before?'

This test was just that easy, I was like, 'I should have aced this last week.'

This task was just that easy, I was like, 'Why am I even here?'