Making films is definitely not simple and I do appreciete the effort that goes in to it, but I do think everyone involved in the process do needs to make sure continuity and previous films are respected.
The route The Predator went down just undermined the previous ones. The creature was better of as an alien hunter looking for a good and challenging game, nothing more. Taking trophies from a successful hunt was brilliant but now apparently, they just want spinal fluid and to invade the earth...
The dna thing is terrible and it does not work that way. I don't know why both franchises had to go down the hybrid and genetic experimentation route.
Sometimes its best to keep a film simple and stay true to its roots. At least in my opinion anyway.
I'm glad Dekker is aware of the flaws, especially when you got some filmmakers like Uwe Boll who will think their movie is brilliant and the best thing ever when its trash.