[yosefk]

The answer is different because an email is not a standalone webpage and there are a lot of things you might want to do in a website that you won't expect to be able or need to do in an email. You probably don't want to control font sizes or page margins in an email, for instance; you probably do want to control color or override some overflow defaults. Maybe I'm off in the above but the point is that you expect to control a subset of things for an email (same as eg for RSS entries) and media selectors aren't obviously necessary for these kinds of things.

[afavour]

What if you want to place two divs alongside each other on desktop but stacked vertically on a phone?

[bitvoid]

How about not placing two divs alongside each other in the first place? Every time I see that, I immediately start looking for the unsubscribe link or mark it as spam.

[afavour]

Your preference is not everyone’s preference. It’s silly to suggest every email client disable media queries because you dislike seeing two elements side by side.

[bitvoid]

That's true, but is anyone going to be up in arms because things are not side by side in an email?

I agree with others that emails should just be plain text. It has never bothered me or anyone else I've known to just have plain text and a link that sends them to an actual webpage if HTML is absolutely necessary.