2) Beginners will just have to muddle their way through like everybody else.
Frankly the biggest problem I see with beginners is they usually don't have a clear idea of what they want to accomplish when building their ponds in the first place. Without a clear goal to shoot for they are left struggling with what they should be doing, and even when they follow advice and direction from others they are often disappointed in the end results because it's not what they expected.
1) Add to that the fact that there are so many variable in this hobby, ones persons advice and experience with their own pond may not directly apply to another pond. Things such are water volume, circulation, depth, temperature, KH, GH, PH, fish stocks, type of fish, frogs?, turtles?, rocks on the bottom?, no rocks? plant stocks, potted plants?, barefoot plants?, hours of sunlight per day, etc... All these things have an effect on how much and what sort of filtration is necessary, or desired.
So yeah, there can never be a decisive discussion on the subject water filtration, but I believe there can be a "serious, decent discussion on the gradation of biological filtration in this hobby," However you also have to temper that with the fact that my idea and your idea of what an ideal pond is, is likely a lot different than anybody else's idea of an ideal pond is, and all we're really left with is a bunch of people just talking about their own observations and theories. Of course I think we can all agree that my observations and theories are better than most. :nananananana: