Contrary to popular sentiment, I'd say it's not the numbers - it's the age.
For my wife and I, babies are easy. Toddlers were way more of a challenge. But for most of our friends they found it the opposite.
I've heard people say before 1 to 2 is harder whilst 2 to 3 is simple, and in this thread 2 to 3 is harder, etcetera. I'd wager a big part of it is 'when' you add each new child, relative to who your other children are and what they are needing at their current developmental stage.
Word salad is what parenting is all about.
Fucking hell, you're a trooper. An hour of story time each night?
Even with your caveat, that's still a long time!
Maxing out the library card is fantastic though. Go you!
It's always tough to balance giving them too much with giving them too little. I sometimes worry my eldest is a bit too sheltered (less so the youngest, because they get similar media experiences because it's not like I can separate their digital time).
Sometimes a bit of scary is good for them, because they have to grow and become prepared for the real world eventually.
My wife always says that we're raising them to be adults, not children.