I know that wire nuts can sometimes have a better failure rate when tested at much higher currents than either connector is rated for but this is equivalent of ingredients causing disease when you consume 1000 times more than is typical.
Or look at how romex/NM (doesn't) hold up to mild rodent activity.
I'm not saying that Wagos are in the same category as receptacle backstabs. The point is there are definitely quality/safety reasons to choose one approved method over another.
We had a mouse chew the romex going to the receptacle for our dishwasher (as well as the drain line). He must’ve gotten quite the shock, since the breaker tripped. The wire was charred and had exposed copper.
Motors and other large inductive loads are especially nasty in this respect, which is why there are several 'curves' in use for ground fault interruptors. The most common, the B curve will do a max or 3 to 5x for a short period of time before it kicks in, but a C or D curve can go much, much higher. And then that contact resistance (which wasn't such a huge problem so far) suddenly is a problem. Now you're generating serious Wattage in a small space that has no good way to get rid of the heat. Imagine an elevator motor or a shop lift or or something like that. This sort of application is where I would never use a Wago. But for regular low power stuff in my house I use them all the time, lights, bedroom outlets and so on. But my 17 KW Solar inverter is using crimped on joints and I checked the torque on the screws in the plug to make sure it's all up to spec. Those are not things to mess around with and hope it will hold.
If you want to have some fun take a FLIR across an older exposed installation, it will definitely help to visualize what contact resistance will do.