And even fewer power banks. Until recently not a single one existed that could put out 100W over the whole battery charge, they all switched to 50-60W for the last 50%, which also means they couldn't fully charge laptops like the larger Macbook Pros. But now there is the Zendure SuperTank Pro:

https://www.kickstarter.com/projects/zendure/supertank-pro-t...

And a lot of 65W rated tagged cables tend to melt under full load, and one of which was bundled by one quite major hardware brand whose name starts with "A."

This is why a lot of charger makers went for "workarounds" for 5A cables rather than risk being blamed for setting mismarked cables on fire.

Their cable marked "65W" did not actually work on 5A 15V, but on 3A 20V where it is not the issue, but will melt when used by actual 5A 15V.

Oh that is good to know! I measured 20V/3,?A on my barrel jack adaptor, now wondering if it can actually do 5A as advertised. Is there a way to query the cable for what it will actually report as supported voltages / current?

Easiest way is to get a PD tester. The hard way: page 363 https://usb.org/sites/default/files/USB%20Type-C%20Spec%20R2...

Did some more research. I don't have a linux system with usb-c rn, but one can maybe query the emarker VDO in sysfs: https://people.kernel.org/bleung/

On windows there are the MUTT tools, but looks cumbersome: https://docs.microsoft.com/en-us/windows-hardware/drivers/us...

Found a hardware thingy that can display CC1/CC2 emarker info.

https://www.youtube.com/watch?v=hMlySYTHbyk

https://www.banggood.com/POWER-Z-PD3_0-QC4_0-USB-Tester-Volt...

The 5A modules / cables are advertised as having an e-marker chip, at least in China.