Be weary of generalities online. Gut biome is an interesting area of study, but we haven't done enough studies and what you hear are mostly small studies that get played up in the media like they are hard science when really they are just to help direct and improve further studies. They were never meant to set any guidelines or direct people to action. We aren't there yet, and with how different everyone's body is with this, it'll likely be a while before anything definitive is suggested to people.

So to answer your question, we don't know. Because gut biomes vary significantly from person to person and will even change over time, and we wouldn't know what you need or don't need or if you're fine as is, it would require a lot of work to try and figure out what might help you if you're having problems. You'd need testing done of a clinical environment.

If you are having gut issues though, consuming good live culture bacteria found in things like yogurt is beneficial. Greek yogurt is the one you hear about most because it has less sugar. This is a standard reccomendation for people going on antibiotics as they don't discriminate which bacteria they kill and putting ones we know help digestion back can reduce side effects of antibiotics.