If you listen to Hoffman's take he says normal brewing extracts more of the flavours so with cold brew you tend to get a much milder coffee with the top end stuff taken out. But because of the brew time you extract more caffeine. So, it's a milder flavour but higher caffeine.
If you listen to Hoffman's take he says normal brewing extracts more of the flavours so with cold brew you tend to get a much milder coffee with the top end stuff taken out. But because of the brew time you extract more caffeine. So, it's a milder flavour but higher caffeine.