"Extenders and factory shocks or get drop shocks"
But Belltech will tell you to use shock extenders/relocation for both...factory and their drop shocks. Why is that?
If I were in the business of selling parts, I'd advise people to buy parts.
They're not
wrong. He was asking about a 3" drop. The extenders would return 2" of that, making the stock shocks "see" only 1" drop which is fine for pretty any normal driving instances. Drop shocks are 2.x" shorter, so they'd be fine as-is. With drop shocks plus the extenders, you'd actually have about 1" of "surplus" travel, which is perfectly fine. So, following BT's recommendation, you wouldn't bottom out for sure (good CYA measure) and they'd sell more parts.
It's not a bad recommendation from them. Just not absolutely necessary with a 3" drop.