No. While my emotions are involved, I've seen how just a single boat in a rather shallow and protected anchorage can create a problem. It stinks, it washes to the shore. It's unpleasant. Read again. E Coli isn't all that matters. I still don't want to be in a marina or anchorage where every other boat is dumping untreated raw sewage.
Even of those here who do dump, I haven't seen a single one who has advocated doing so in a marina or a tight anchorage. However, if there were no rules, I'm sure some people would and I'm sure some do today.
I will say this too with all the anchoring discussions in South Florida over the last couple of years, I, like most here, thought those opposing anchorage were often being unreasonable. Then I talked to one waterfront land owner most opposed to anchoring and he showed me some photos, then I went with him to his property. He was in a great area for anchoring, very little water movement. What little there was flowed primarily toward the shore and his property. He had to regularly have someone clean up small beach area. There was also an odor. He said five boats had been anchored there the night before but he had no idea how many dumped their sewage. It was disgusting.
So, I stand by my statement which wasn't about flowing channels or out to see, but about marinas and anchorages.