Thanks, flicky, for the message. I am in a similar situation with my main site (which is 9 years old) and I have been thinking to "upgrade" to modern HTML and CSS. However, your report has made me re-think. I won't "upgrade" anytime soon.
Recently, I have become very suspicious when I read "Google says" or "Google recommends". Often, doing the very opposite of what Google says or recommends is good for me. Go figure.