In short, the compatibility of the cable:
-Huawei/Honor up to 100W.
-Xiaomi up to 27W due to the lack of xiaomi-configuration pin in devices that charge with 9V/3A.
-Supervooc up to 33W due to the lack of high-current pin.
-It can be used at high speed with some exotic phones like Vivo, ZTE Nubia, Meizu that are not popular in Greece.
Edit: The reason it does not charge laptops from qc3.0 is that laptops charge from power delivery. I am not changing the rating for now, but I will return once I procure a Baseus power bank because they are perhaps the only devices that draw high power (P greater than 18W) from qc3.0 and that’s where the usefulness of the cable will be evident.
On the Xiaomi phone I have, it cannot draw power above 18W from qc3.0, it’s not the cable's fault but the protocol change.

1st evaluation:
- Quality cable from Baseus. Charges phones up to 100W in a 20V/5A configuration.
- It is made for high-speed charging on Huawei but works very well with Xiaomi too. It satisfactorily replaces the original Xiaomi 33W using a charger from another manufacturer (edit: charges around 15 to 18W).

1 star is deducted for the reason:
It does not charge laptops at 20V. Seeing the 100W indication, I suspected it would also charge laptops. Ultimately, after researching related websites, I noticed that the 100W is intended for a specific Huawei/Honor charging configuration (...see edit).

Charging portable devices with different protocols and speeds has made finding the right cable a complicated matter, and manufacturers could be more informative regarding the purpose of each cable.

Surprise:
While it does not work with Oppo's Supervooc technology when used with a Baseus charger or another third-party manufacturer, when connected to the original Supervooc charger at 33W, it charged an Oppo phone at full speed.