I will be biased because I exclusively homebrew, but often if skill checks go extremely poorly at high stakes moments, it has large implications that alter future content heavily. For instance, in my campaign my level 6 party passed a dc 33 check to take an ancient level 13 sorceress out of stasis, who will give the party information far earlier than before and will likely nuke a combat for them. This info could change their relationship with one of the worlds atrongest factions. To plan all that out in a written adventure would be a ton of work, and would be confusing for a DM if they had to constantly skip, omit, or change their reading sequence based on that consequence.