I dont think its bitterness it just that some players what something more interesting than just the same old same old dont get me wrong thats great that we got it but how long will it last? you know how fast player burn through content.
And besides do you really think the average player care on how much time put into the work? no they want to know if its fun or not
new fights, ill give you that but however the mechanic will always be reused assets.
New models but more of reskin over the existing models. Heck one model i was surprised they "changed" was the lala one. remember they used a lala model for dulia-chai