Backstabs should be banned, IMO. Has anyone else seen the REALLY scary PRC ones that don't even HAVE the screw terminals as an option?
The backwired pressure clamp ones are the way to go. Almost as fast to install as backstabs, and easier to disconnect without unlooping/bending the wire.
Rewired a house (Northern NJ) one time that had been converted from gas lighting to electricity (sometime in the 1920's). The sparkies reused the existing gas pipes as conduit for the lighting circuits! How they managed to pull wire through plumbing ells without shredding the insulation I have no idea, but this installation was in use up until around 2000. House went up for sale and buyers insurance Co. demanded a rewire.
Service equipment looked "fabricate on site", consisting of a slate panel with 6 open blade knife switches and bare wire fuses. A small hank of spare "fuse wire" was hanging neatly on a hook nearby. Looked like thin (~18 AWG) solid core solder. All enclosed for safety in an enclosure made from asbestos board! Insurance demanded that be professionally abated, as well.