Yes. I don't endorse WhatsApp. What I meant is if you chat with 15 people out of which 5 use WhatsApp, only those 5 chats are potentially readable by Meta. Because those are the only chats which will get sent to Meta servers.
So you have the benefit that the other 10 chats are not readable by Meta.
If you are rooted and the app doesn't need any gapps, try hide prop config magisk module. (Some apps have fallbacks for gapps built in like Uber has OSM as fallback for gmaps in India atleast)