But one uses very little of it, and bitterness is not the worst attribute in a beer ingredient....
Worth noting one of the comments to the Pursuit of Abbeyness article I linked above :
Dark syrups and sugars do not add the amount of color most think they do. If you crunch the numbers and use Post-Boil Volume as the input to the Morey equation rather than the generally accepted value of Fermenter volume (this will distort the color prediction high), you’ll see that save for the darkest of syrups being produced, you’d actually need whopping amounts to match some of the colors in BLAM and that are quoted in other sources for these beers.
I would say that many are still using dark syrups or sugars for the lion’s share of color and to be clear, I can’t say with certainty that other breweries besides Rochefort are using a flavor neutral colorant. [such as
Pure Malt RB1500/40 or Sinamar]