IMO the only safe domestic plug/socket designs are:
Type G (UK), moulded.
Fused, earthed, insulated so you can’t touch live mains, can support its own weight.
Socket switched & shielded until Earth inserted.
Type F (Schuko), moulded.
Earthed, shrouded socket so you can’t touch live mains (unless you try reeeally hard), can support its own weight.
—
Type A (USA), all types.
Truly awful