Why were old-school bodybuilders less vascular than the current generation one ?

I was looking at photos of Arnold, Frank Zane etc in their prime. Noticed that they were a lot less vascular, less veins popping out than the current ones. I can see that bodybuilders of the previous era had decent size, compared to mass monsters of today. Had greek god aesthetics but they didn't have the vein popping look to them when compared to current bb'ers like Big Ramy, Kai Greene, Ronnie etc. 1. What was the difference between their "stack" or "gear" ? 2. I presume some drug causes extreme dehydration to give you that look. Which is it ? 3. Any ideas when this trend started ?

Thanks.

submitted by /u/sidchelseafan
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