I'm not sure what you're talking about here. The latest language in Lisp family is Clojure and it came out in 2007. The syntax that it uses is quite a bit different from Lisps from 30 years go.

I wouldn't call it quite a bit different. Really just seems to have a few small changes where they prefer [] over (). Otherwise just a different set of standard macros.

Or are you referring to some other difference?

Clojure is not that different, but besides that, parent implied changes from Lisp circa '60s that were already in CommonLisp and Scheme 30 years ago...

I understand that by "IT industry" you mean the Web, which is the industry's equivalent of a fashion show.

Work clothes, suits and hazmat wear also don't change their design every three months.

Not redesign, but recycle old ideas. It might change in details, but as far as I've thus far observed, IT operates in cycles. The terminal + mainframe -> the personal computer -> the cloud (personal mainframe) -> ?

Like cycles in economics, climate, fashion, etc.

No, I mean the IT industry. I have been following it since the mid-eighties...