You need to add cheap, undodgeable instant kills to your list OP.
It was at the point in DS1 where, after taking ages to defeat Tauros, I think, I came to a giant bridge. As soon as I was slightly across that bridge a dragon swoops down and engulfs the entire bridge in flames that kill you instantly. There is also no bonfire between this bridge and the boss you've just beaten. That was where I knew it was time to just give up and stop wasting my time and energy and move on to superior games.
Also, easier difficulty does NOT defeat the purpose of the game. It makes it accessible to a wider audience and is entirely optional to people who don't want that.
The main reason people seem to not want souls games to have easier difficulties isn't because they think the game is better that way or it's "how the game is meant to be", I tend to find that it's more simply so that people can brag how awesome they are at games because they can win at Soulsbourn and don't want more people intruding on 'their turf'.
This is like the quintessential Souls thread shitpost.
It even has the "Souls fans just like to brag" line. Just beautiful.