An interesting disconnect to me is that I thought you were referring to generic websites, not ones that you can actually add/do stuff in. Contrast a site like "Youtube" where you usually just passively consumer (and indeed it DOES have a shortcut list viewed by typing '?') and something like jira where users are expected to be somewhat familiar and doing lots of things
Like I say, the big problem here is 'realising that googling "$site keyboard shortcuts" actually has a point in the first place' - hence why I tell people about '?' any time I think it might be useful :D
