Well firstly, you donāt only have to farm them for def. Sewers arenāt the only place to get it, just the most consistent.
Secondly, what would be wrong with that? UDLs are usually the most consistent farm for wis pots, and Snake pits are the most consistent place for speed pots. Is this bad? I certainly donāt think so.
Face it - Abysses are fine as is.