Doug, I find that to be a highly problematic aspect of Pyrrhonism. As you say, the idea is to follow customs and ancestral laws, because discussions of ethical matters is considered part of the things that are "non evident" and therefore we cannot (allegedly) have reasoned, grounded opinions about them.

But a lot of the problems in society derive precisely from customs and ancestral laws. Those are the very things we are trying to change. Like slavery, discrimination, war. It simply doesn't seem a good idea at all to advice people to think this way.