Family Handyman Approved: WAGO Lever Nuts

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How are these not like the push in connections in a light switch or outlet? They make very little contact and are unreliable.

There's lots of videos on these. Basically, in normal use they are the same as wire nuts. Videos of failures occur when the put ridiculously high current through them. That said, they're expensive and unnecessary for permanent wire joints. But traditional wire nuts are not designed to be disconnected and reconnected. As such, there are four places where these Wago's excel. First is on fixtures that are likely to be changed or upgraded in the future. I use them when installing light fixtures to make it easy to change out. Second area is when installing "smart" devices like WiFi wall switches or outlets. These will need to be changed as technology improves and changing them should be easy and designed into their installation. The third application is when a box is getting full and you need a little extra space. The wires laying parallel to each other and not twisted together makes it easier to bend them around to fit in tighter spaces. And finally, they are definitely superior when connecting a mix of solid and stranded wires as each wire has it's own clamping connection.

These and their likes have been on the market for ages

Well, this video was no help. My new fixture came with wago nuts but no instructions on how to use instead of using the wire nuts.