Filtration when done properly can be beneficial. But it's extremely difficult to do it well without oxidizing the beer and wihout stripping too much flavor.
High gravity I'm inclined to agree. Yeast don't like high gravity wort, and the ferment needs far more attention than usual. Even when done well, a 16 Plato OG beer diluted to the same strength as a 12 Plato OG beer post-fermentation will have higher levels of Fusel alcohols and the like. In general, the 12 Plato neighborhood is a really nice sweet spot IMO. It's about as high gravity as you can get before the fermentation begins to suffer. That doesn't mean higher gravity beers are bad, but above 13 Plato Fusel levels see a sharp increase and it just generally becomes increasingly more difficult to achieve a good ferment.
Dilution when done properly doesn't necessarily oxidize the beer. But done improperly it definitely will.
Adjuncts like unmalted grain, rice, corn, etc I'd also agree about. Even unmalted barley doesn't taste as good as malted barley. The malting process unlocks a lot of great flavors.Statistics: Posted by Techbrau — Mon Dec 19, 2016 9:58 am
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