Retention holsters are good, just adds another level of security, situational awareness works to that end also.
The proverbial gun snatch is a leading ol' wives tale. Show me one (1) incident where a non-LEO/military has in modern times in the USA ever been successfully subjected to such. Several over the years have attempted and failed at such cites, it just doesn't happen. Possible? sure but the resultant numerical ratio will likely look like .00001% or less - better odds you won't find.
Want to snatch/grab my gun?......you'd rather attempt to grab a rattlesnake's tongue. We both would take serious umbrage.
Don't know of any state statute or local ordinance that requires a retention holster. Point of fact a holster is not required, its just good form - know what I mean ol' chap - more civilized and all that. Besides which, it is what we do on OCDO - promote and defend the right to open carry properly holstered handguns as we go about our normal everyday lives