Facebook Chat is basically a messaging business on its own. Given that Google has tried and failed to get into this space COUNTLESS times over the years, I'd call that a pretty solid new product offering from them.
Facebook has also innovated significantly in adtech afaik
Zuck has to build a v1 product from scratch with the Metaverse. When's the last time FB has truly built a revolutionary v1 product? It's not really in their DNA anymore. I'm not saying they can't do it, but I wouldn't point to IG and WhatsApp as examples of why Zuck can pull it off.