And needs to be seeded and maintained.
I think people get lazy and a bit bored after a number of years. They don't do as many water changes as they used to because the tank is running great after a few years.
Then the first place you will have problems will be your DSB.
So the problem is blamed there but in reality it is the husbandry of the tank that is the real problem. 
My 2 cents.
I can't comment on running BB as I have always had sand. I just can't see how you would keep some fish happy without sand.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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