You can just go download some trading software like thinkorswim or IBKR TWS to see what's trader UI. VC UI probably means some UI in a VC-funded company whose goal is to reach high number of users as quickly as possible, and the UI is optimized for that goal.
A more charitable way of putting it is, you can make a pretty presentation when you know the data that you are trying to present and the story you are trying to tell. I can't imagine a 3 column pricing table that wasn't done in bootstrap (Venture Capital UI)
Traders look at screens searching for meaning across a bunch of different data. They are trying to construct a story and as much context as possible is important.
The problem comes when VC UI is applied to a Trader problem where you want to see as much information as possible to understand, but there is padding, rounded corners and other stuff forcing you to scroll.
Look at this screenshot of a Bloomberg terminal
https://www.investopedia.com/thmb/trBFMDD8xeZkhLiLscngql3FV_...