First, I want to tackle the premise of authorial intent. Specifically that it matters, kind of at all. Let's look at some real life examples.

Your examples are not the norm of communicative acts, however. I spend a lot of time in cognitive linguistics and authorial intent is immensely important in constructing both narrative and non-narrative and communicating it to others. Disregarding authorial intent is your choice, but then you will not understand what was actually being conveyed.

The general populace being lazy or impatient is a dangerous line of thinking

It's my opinion and I don't feel endangered by it.

The picture is spoiled from the start

Not an analogous example; the spoiler would be having someone show you which pieces go together.

This, couple with the earlier comment about general populace being lazy, is, I think, harmful and a form of gatekeeping that is unfair and frankly offensive.

#triggered

No true gamer would play with a walkthrough.

Not the point of my comment.