I agree with your sentiment. Meet the customer where they are at, right?
Years ago, I would have said small bussinesses are on cPanel, FTP-ing files to the server. Asking them to run NodeJS is crazy. But here we are, the hosting landscape is vastly different, is it still so crazy to ask a small business owner to put there code on GH, connect GH to a hosting platform and push?
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Anyway, I doubt you will see people dropping off WP and migrating sites to EmDash. What's more likely will be that it is considered as an alternatave for new projects.