Question about wiring elec outlets from one to the other

https://www2.panasonic.biz/jp/densetsu/haisen/switch_concent/cosmo_wide21/lineup/concent/komameni/img/on_off/img_feature04.jpg

Found this picture on panasonic about their outlet switch that are rated for 20A. They basically say that when using a usual switch (used for lightning etc, rated for 15A) to switch an outlet you need to change the breaker to 15A (I guess because the switch is the bottleneck now) to protect the circuit.

Does anyone know why in the first picture it’s okay to use a 20A breaker with outlets only rated for 15A 125V?

Standard outlet specifications: https://www2.panasonic.biz/ideacontout/2020/09/29/2020092900220091.PDF

afaik you can hook these up from one to the other by connecting the one next in line with the connections in red in this pic: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRx0caI8MUVbQT15Bz6Aw3-br07FldjHvVSeA&usqp=CAU

For example wouldnt loading the circuit with 19A be dangerous and possible melt the outlet? (assuming the wires used are suitably rated for 20A+ and thus are unaffected). Why doesnt the circuit with outlets rated only for 15A need a 15A breaker like in the 3rd picture with the switch?