The fact that everybody has pushed the Daleks into the darkness of an erased history is what’s dangerous about them in the first place and where their power comes from.
I am loath to post something saying, basically, “Go read Phil Sandifer’s piece on why the Daleks are scary because of their non-scariness”, but, well. Do it.
I’ve listened to the audio play he’s talking about (Jubilee) and I have to say it’s quite brilliant. It brought back all of my childhood fears of the Daleks. Definitely worth a listen.