[ryanbrunner]

I'm assuming that the thought process businesses are going through goes something like:

- We have a complex series of integrations (marketing automation -> CRM system -> app -> transactional e-mail provider) (as one example) where propagation isn't real time and could take a few days (if say, each of these were propagated on a nightly batch).

- Something could go wrong with any of these.

- It's better to err on the side of caution and give a super-conservative estimate and always beat it by a huge margin, than give an accurate estimate and occasionally break it (particularly with something as sensitive as unsubscribes).