Change unsupervised Household dedupe rule to email only
As @DaveD pointed out, the default unsupervised Household dedupe rule that matches on name or email doesn't make a lot of sense. Presumably, you could easily have multiple households with the name "Jones family" or similar in whatever format you choose for household names. You wouldn't want these to be merged automatically.
I think the easiest and clearest solution is only to merge households with the same email, but then that won't help those without emails. We could do something like threshold 20, email 20, name 10, street address 10, phone 10, but I'm not sure we gain much from that. We can keep name or email as the supervised rule.