The way I see it, if it DOESN'T have a hammer, it better have a safety.
And I mean a safety lever, button, (push or slide) one that stays in the position you set it, until YOU decide to change it. I will accept a decocking lever, although I do not understand WHY anyone would make a decocking "safety", but they do.
I believe that a safety, when placed "on", should prevent the gun from firing, when the hand is in the shooting grip and the trigger is deliberately pulled, as well as when it is not.
I own a couple dozen pistols, roughly evenly split between revolvers and semi autos, with a couple of single shots as well.
The only centerfire ones I own that are striker fired are my P.08 Lugers, and my Remington XP-100, and they both have safeties!