I was interested in this game but didn't want to jump to any conclusions. So I downloaded the preview, read it, and offered my opinion on the mechanics.It did kind of come across as someone going into a Starbucks to tell everyone they think Dunkin' Donuts has superior coffee.

It seems whenever a kickstarter comes out (or for that matter any 5e book), you either have jump onboard the hype train or be a hater. Everything is either the best thing ever or the worst thing ever. It's not healthy.
I'm not sure I have a good sense of why any kickstarter does well or poorly, but the marketing for this one has been really good: the art and overall presentation looks great, and importantly the creator has a well established following from her work making adventures for 5e and her youtube channel. Also, a number of popular youtube channels promoted it all at the same time. I suppose it's also clear that the author is going to be supporting this system moving forward with more content, so that's a good selling point.Joking aside, why do you think the game is doing as well as it is?
Surely there is a lesson here other designers should be paying attention to?