F1 pitting under sc/vsc

Vettel lost Spanish GP due to clever strategy after Hamilton pitted at the end of vsc forcing Vet to pit under green flag. Personally I think it is hard on Vettel as it is 2nd time this season his race was affected by sc/vsc. But good thinking by Merc.

What is your take on it? Should sc/vsc periods be regulated in regards to pit stops and how is it regulated in us racing where sc periods are more frequent?

It seems to me some teams (RB) are gambling with tactics (getting rid of harder tyre early) to take advantage of late sc and some even forced sc in the past to help other driver (Piquet Jr/Alonso).

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