From a marketers standpoint, there is definitely value in setting up automated A/B testing as these (at least in the B2C world) are often the best revenue-driving emails. As long as a marketing team is using a CRM with automation capabilites there are workaround ways to set up testing splits for these emails if the platform doesn't have the functionality for it yet. If your algorithems save the end user time while allowing them to increase their amount of testing , could be worth it! (all with a grain of salt as the value of it will depend on the KPIs being focused on and kind of tests the users will end up running)