pigtailing or back stabbing outlets
If properly done back stabbing is OK , that's what they make the holes for but I don't like it either.
I hate to go behind some electrician ( if you can call him that) that has skinned the wire to much and bear copper stickes out after back stabbing.
If I do or my help does it, I only allow it to be done on outlets.
Switches are a no no in case someone puts the travellers on the wrong side, I can switch them easier.
Pig-tailing OK as long as its done properly also but only if necessary.
Like everything else someone always screws it up and gives it a bad wrap.
I have even seen aluminum wire backed stabbed. What kind of idiot would do that?
Semper Fi Buddy