You all hit on good points. I think it comes down to variation. You push to the edge of CNS overload....then reduce weights and volume by as much as 50% and de-load for a week or more if needed. Spend that time just chasing the pump and getting blood in there. I look at it as feeder sets.
Harris brings up a good point as well. I never train front delts directly. I also superset all my bench sets with face pulls. It teaches you the concept of retracting your scapula, and you need that rear delt/rear back strength for proper posture.
As far as rep ranges go, I think you have to find what works best for you. Our bodies are made up of a combination of fast twitch and slow twitch muscles....and each respond differently to certain rep ranges.
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