Perhaps that is your response, but it’s not true of everybody. I’ve done a lot of experiments with different types of email, and beautiful emails always get significantly better response rates.
Even when communicating important information, using the company design has been the norm since graphic printing was invented. Even something as transactional as a bank statement or court summon will use the sending organization's logo, fonts and colors.
Well, that depends. Is it something I need to see? Did I proactively ask for it, or did I neglect to opt out? Etc, etc. If you are having to measure response rate, and it doesn't involve an emergency alert or some such, it is probably spam.
OK. So what, I'm not going to complete my password reset notification because the page isn't beautiful? If you are tracking response rates it is because people aren't expecting an email, because they didn't ask for one (i.e. it isn't a password reset notification). GP is right - I want information I /need/ to be in an email in a succinct format, and I don't want emails I don't need.