Not everyone embraced it.
I still use a plain-text email client.
I still use a plain-text email client.
And part of what irritates me shows up in your answer. This feeling of superiority of being in the "in-group" that seeps out.
If someone is saying "I think this, and therefore everyone thinks this", then how common their opinion is becomes relevant.
I can't think of a single person I know that uses a text-only email client (and yes, I know more than one of them) who isn't what you'd call a "power user".
All of them know that most people don't use a plain-text email client, they just prefer to use one themselves.
The idea of "reactions" to email is, to me, silly and unnecessary.