At this point in my lifting career, I have a decent sense of what drives better hypertrophy for me, and aside from sheer volume, I get more response from heavier stretch-mediated resistance training than I do from metabolite and pump work.
As a result, my biceps seem to grow more when I do more pull ups / rows / pulls / ring work than I ever get from bicep curls, whether barbells, dumbbells, or whatever.
And while stretch-focused curls (incline, preacher) are a little better, they still seem to be less effective as the compounds as they're just not as heavy.
For the time it takes me to do 4-5 sets of bicep curls, and the impact on systemic fatigue, I could do 1 more set of a compound pulling exercise. Maybe 2.
Other than a little minimal curl work for elbow health in snatches, I have no functional need for bigger biceps. It's purely beach work.
Is it time to just chuck the curls in the waste basket?