That’s cos it changed with Derleth.
Personally, it ruins the higher difficulty levels for me. Given my busy schedule, I get to play 1 game in the mornings before work, which will take me around 5-6 months to complete. So I like to take my time and savour the experience. Legendary especially forces me to race towards the finish line, and frankly that’s just no fun, so I don’t play on it.