Bioballs are a nitrate factory.. good biological filtration but nitrates build up over time
in fish only systems this is not a huge problem unless excess waste is going into the tank. generally a skimmer and regular maintenance can alleviate problem.
LFS use these systems because they are easy and effective and they generally don't have livestock in these systems long term
in a home system your animals are there for life and especially if it is a reef or mixed reef these built up nitrates can cause problems.
we must remove nitrates from our systems faster than it is created. bioballs being removed is just a faster means to that end, they can be used but better not to
bottom line is for nitrate production, bioballs work too well
if you have the means to remove nitrates faster or more efficiently than they are being produced then bioballs are fine