Generally neither necessary nor a good idea, IMO, but there are just some people that don't want it that way & it's really no worse than other guns absent the grip safety.
I would just suggest that the detent on the thumb safety be in good shape so that the safety does not easily come off accidentally.
I actually still have a parts gun that due to tolerances & hole spacing, a normal grip safety will not stop the gun from firing, so it has only an active thumb safety.
MM
