Yeah, the first example on that site doesn't need any formatting. It just says your code is <code>

What about images, links? Formatted text like bold or underline?

I also prefer plain text, but in most of my emails I talk about technical stuff, or I send transactional emails that require actions, in which case showing buttons is a much better user experience than plain text.

A picture is worth a thousand words.

Plain text? Pffft.

Human language is an unnecessary abstraction, just like images.

I wish everyone would communicate in pure Binary.