[xg15]

That's what sensible defaults are for.

But in this case, we're dealing with users who somehow managed to disable JS, but are still surprised by the effects and don't read prompts.

I'm pretty sure such users exist, however instead of directly basing your UI descisions on this scenario, why not trying to investigate where such behavior comes from and how frequent it is?

[derefr]

Imagine a user whose internet isn't working. They go into their web browser's Preferences and start fiddling with things at random "until it works again" (for entirely unrelated reasons.) Then they leave things however they just made them.