To be fair, VSA can be used without candlestick patterns. I.e. you don't need to know what "Bullish engulfing superman butterfly cyclone"* is to analyse volume and track trends. Although there seems to be a push to apply VSA to candlestick patterns though. This is fine but it depends how you want to look at things.
To me, candlestick patterns are an advanced topic as a way of visualizing supply and demand. I think it's a far greater task to understand supply and demand on a more fundamental level before tackling patterns. I am not sure if people will agree. They might think patterns are an easier shortcut instead of doing an in depth and lengthy study of how markets move.
*I may have made that up.