Is backstabbing outlets really that bad or just a preference thing?

Backstabbing is basially the number one cause of 'half my room has no power' calls for service electricians. Those internal spring clips have a tiny contact patch on the wire, and over time, the constant heating and cooling of the copper causes that tension to fail. Once it's loose, you get arcing, wich leads to charred plastic and eventually a dead circuit. It’s not just a preference; it’s a major reliability issue.

The biggest problem with using the device as a bridge—which is what happens when you use both sets of backstabs—is that the entire downstream load is pulling thru that one cheap outlet. If you pigtail, the outlet is just a stop on the line. If the outlet burns out or the tab breaks, the rest of the room stays powered. In those cramped blue plastic boxes, it’s a pain, but it's worth the extra five minutes now so you aren't cutting holes in your finished basement walls later to find a hidden break.

If the space is really the issue, stop using traditional wire nuts and switch to **lever-nuts** like Wagos. They take up way less room than a big tan or red wire nut and they’re much more secure than backstabbing. You can tuck them into the back corners of the box much easier, which leaves you plenty of room to fold the wires back without fighting the ground. Don't rely on the 'push-in' holes. If you absolutely refuse to pigtail, at least use the side screws and loop the wire properly. But honestly, if you're allready in there and the walls are open, do it the right way. It's way cheaper to buy a box of connectors than it is to pay an electrician a service call fee to find one loose connection three years from now.

I didn't realize those backstabs were limited to certain wire sizes. I just tried to push a thicker wire into one and it wouldn't even budge, so maybe my house's wiring is making the choice for me! Are those Wago lever-nuts acutally as easy as they look? I’ve seen them at the hardware store but was worried they might be 'gimmicky' compared to the old-school twisty nuts. If they realy save that much space in a tiny box, I might go grab a pack today. Also, do I need to strip the wire back further for those than I woud for a side screw?

Check if you're using cheap residential grade outlets or commercial ones. People often mix up "back-wire" and "back-stab." The commercial ones have a clamping plate tightened by the side screw. It's way easier to pack into those shallow blue boxes beacuse the wires go straight in the back, but you still get a rock-solid mechanical connection.

I switched to those for my shop circuits. You get the speed of the push-in style without the fire hazard of the spring clips. If you're buying the 75-cent specials, you’re asking for a headache, but the $3 spec-grade ones make the job a breeze without the bulk of a pigtail.