Why have 18 skills when you can have FIVE? We’re giving D&D players more agency over the narrative implementation of their skillsets by streamlining a bloated system and highlighting a popular variant rule.
Scaling up Difficulty Class (DC) on successive checks is a bad idea. Some DMs like to increase DCs on successive attempts, dissatisfied with the relative ease of a standard skill check (or saving throw). However, doing this has drawbacks which you can see in action on the DC Increase Chart.