It is a trade off between dumped salts from the wash aid and the increased water with a small amount of hypo and silver complexes. However, in the larger view, you have to get rid of the hypo and silver complexes so it boils down to the pollution "demand" imposed by the wash aid.

And, modern day RC papers take less washing anyhow.

For those who yelp about FB papers, they are more heavily calenared nowdays and thus the papers are less porous. If you don't believe me, check a modern FB such as Ilford MGIV and comapre it with a 20 or 40 year old sample of say Kodabromide. There is quite a difference.