What you wrote triggered in a thought in my head.

Eventually, once SaaS subscriptions become more commonplace among the rest of the population, a significant number of people are going to be annoyed by the disconnect between the automated emails they receive and the features they’ve already tried out as a new user.

One or two people will see an opportunity and take VC money to fix the disconnect: a way to make email automations smarter by deepening the integration between ESPs and SaaS code bases, as you have done with this oss project.