Casual characteristics in Hardcore Game

On Tuesday, we discussed the differences between casual games and hardcore games. We used a chapter from Jesper Juul’s book Casual Revolution to help differentiate casual games from hardcore games and define them as two separate entities.
What we didn’t discuss though was how hardcore games could have some casual game elements. Here’s a link I’ve found on a hardcore game having some casual game qualities:

This gets me thinking, are there any hardcore games that could be borderline casual games or games that share qualities of both hardcore games and casual games?