Update from my earlier post of 18th of May (5-18-2017) above regarding the charging issue.
I continued to buy and experiment with longer cables to be able to actually work with the tablet whilst charging it and without having to be within 50 cm of a wall socket, which is rarely the case when working on a desk or on the move somewhere.
I found a cable that does work: the tablet will charge whilst you are operating it; please take a look here: https://www.aliexpress.com/item/ ... 8-9fe1-12331e5ead3c
I boought the 3m cable and it does the job, however you have to cut the plastic at the tip of the USB-C end so that the cable goes in deeper and makes properly contact. But that is a 3 seconds job and doesn't weaken the cable or the connector in any way.
As you can see the charging rate is usually between 1100 and 1200 milliwatts which is enough to "charge it whilst working". If you use the original cable, you may get a little higher performance like 1500 to 1600 milliwatts, maybe because of the length of the cable, maybe because of the build quality?!?!
This 1100 to 1200 mW is good enough for me.
As you can see it is working, the charging window provides the right information.
So, conclusion is, only use QC3.0 cables; this should be indicated on the website where you try to purchase it from. If it doesn't say explicitly QC3.0 than don't buy it as it will not work. Same for the adapter, if you choose to replace your adapter (especially in Europe where we received a dodgy converter that I manage to keep together with some rope) than choose a proper QC3.0 adapter.
Hope this helps.