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For a year, I didn't do any bicep curls because I found out about the glory of compound moves. As a result, my biceps grew a little, but not much. Soon they were the limiting factor, the 'bottleneck', in my weight lifting. Once I switched to THT, my biceps starting growing, but it became my shoulders that were the bottleneck (even though they were growing). Once I started making sure to hit shoulders thoroughly, they stopped being the bottleneck and everything grew again.

Curls without compound aren't much good, compound without curls are better but not much good once you're past the beginner stage: but when the two are together, it's like a multiplier effect.