I don't understand how you can say that the product is more cumbersome.
Another reason that Flattr 1.0 failed is because it was too cumbersome both for tippers (that had to click yet another "Like"-like button) and for website developers (that had to implement the "Flattr" buttons).
And Flattr 1.0 already had fees, 11% IIRC.
And then Patreon swooped in with their much simpler model (X$/month to a specific creator) and ate Flattr's lunch.
Now with Flattr 2.0 you just have a browser extension you have to install, and it's automatic after that! How much easier can it get!?