Earlier quoted context omitted.
Sure, determining past obviousness can be hard. That's why you bring an expert or many experts to attest to how obvious the technique is. But you don't need an expert for novelty. Either you can show a prior art or you can't. I'll grant that there may be some some edge cases where the prior art needs some nuanced interpretation from an expert witness.
I think we agree :-). I was thinking of the more subtle version of novelty which is perhaps best expressed as, "as requested". Here is a fictional example of what I'm thinking about. Lets say someone asks you to make a mud pie[1] and put bits of lavastone in it. You make your mud pie and then you patent "system and method for creating a mud pie with lava stones." Perhaps there is no prior art because nobody asked for…
So, adding stones is not very novel. There's also not much difference between a lava stone and a non-lava stone; if I can put in a non-lava stone, I can probably just as easily put in a lava stone. Is it not obvious that if I can put a quartz into a mud pie, I could also put a lava stone?
I guess the general strategy is to find the more general pattern and then show that the patent is just a specific instance of a larger, known pattern.