I will just point out that there is no one who says you have to write 1500 words a day. It is a choice you have, that is just the requirements to get the Minimum Guarantee System. If you are okay not getting the minimum guarantee, then you can release as you want, however, the chapters need to be a minimum of 1000 words to be uploaded as a premium chapter. Most likely so that the reader will get something for their money.
I have two novels contracted through Webnovel, and I have never gotten the minimum guarantee system, but I have, on the other hand, neither been forced to do 1500 words a day. I made a decision, and everyone has the right to make the same decision.
We also have to remember that there are two types of contracts to get your novels up on Webnovel, one is the exclusive that goes directly through webnovel, another is a non-exclusive that goes through EMP. I have tried both contracts and are quite pleased with how things are now.