this feels like adding alot more problems to solve one..
just use twig and make template... i mean how often do you need to re-design the email templates?
greater compatibility email clients (because it blocks you from using css not allowed) offers components to facilitate and give compatibility to email clients, has an email client simulator, allows using jsx, allows using styled-components, is being applied to turn css not allowed by email clients you make into css allowed (automatically by the compiler) how can this be useless?