I think it’s a spectrum. Unless the double-click delay is ultra short, I’m pretty sure you would discover it sooner or later. My point was that you couldn’t expect someone to learn how to use a computer without any training or instructions, so if you need that anyway, you can also include less discoverable features in it.

There is a trade-off between feature sets that are useful if you know them and super discoverable feature sets, in the sense that the reason some feature is more efficient can also make it less discoverable.