Vergil's Downfall is the shortest speedrun in the series. Because, it revolve around movement more than the combat itself. In Definitive Edtion, developers wanted to balance those out without making changes that would be disruptive to strategies.
This page includes information on the character.
A couple of Vergil's attacks were a bit over powered. We wanted to balance those out without making changes that would be disruptive to strategies and muscle memory players have spent time mastering.
There were also a couple of attacks we felt we could improve the 'feel' of with tiny adjustments to hang timings, strike timings, etc.
Compared to Dante, Vergil skip focuses on utilizing Trick Up and Killer Bee to avoid triggers such as cutscene and wave fights.