Key word "notional" - in more ways than one.....
My overall rule (to paraphrase the Wizard of Oz) is often: "Pay no attention to that analyst behind the curtain".
Tulip Mania - google it.
And other much more recent market busts.
I am a diversified, conservative investor with limited but tangible investments in several places.
That is just me and I will leave others to make their own decisions - one way or another.