...has anyone ever come on here worrying that the books their child gets a too hard?
Honestly, people, don't worry. The very fact that you are thinking about it means that your child will learn to read. It's not a race, or a competition. Reading slightly too easy books won't do any harm. Just because I can read James Joyce and Shakespeare doesn't mean that I don't read Agatha Christie or Maeve Binchy. Nobody ever says to a grown up "my, you're a good reader"! They are just readers, as your child will be, (sn possibly excepted, of course) by the time they are 7 of 8.