Now I've used the interface more I'm not sure it's right.
Here are my suggestions.
EmailFactoryInterface and add the methods to MailerInterface instead....$params is not helpful because it prevents any further parameters. We can instead have array $params.$send = TRUE so we can merge pairs of functions newEntityEmail() and sendEntityEmail() into entityEmail().entityEmail() and typedEmail() into email(), and the first parameter is string|ConfigEntityInterface.MailManagerInterface::mail().)$email->send() from MailManagerReplacement::mail(), and instead EmailBuilderInterface::fromArray() creates the email passing $message['send'].Coding details:
In EmailFactory::initEmail() remove the code "Load builders with matching ID." and put it into EmailBuilderManager::applyPolicy().
Mark both EmailBuilderManager and EmailAdjusterManager services with a new tag init_email.
Create EmailInitInterface with a single function applyPolicy()
EmailFactory::initEmail() calls applyPolicy() on all tagged services.
Maybe create a new class HooksEmailProcessor extending EmailProcessorCustomBase to contain the code "Apply hooks.".
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Hi I added a initial ideas to this issue please revise.