The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
there was a study published in science on the hadza that actually showed that the seasonality of their diet was what led to was likely what led to increased diversity because they were eating different things during different periods of the year and essentially certain microbes would go down to almost non-existent in the gut only to flourish again in the next season when they were eating different foods that that led to those
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what you see here is they followed 2700 gathers they were just following them around with poo cups i guess and they see that seasonally there was significant variation in the types of species and they say the data reveal annual cyclic reconfiguration of the microbiome in which some taxes become undetectable only to reappear in a subsequent season
during the dry season the the microbial composition of the hodds of gut began to look more like a western gut as they ate more meat
the the gum microbiome really is flexible and i think that's that's shown in in the haza it's shown in humans being able to eat a wide variety of diets and and thrive on those
i strongly believe that the haza gut is not quote healthy it's not diverse because of the fiber they're eating because they're not really eating much fiber it's because of their environment
Here's the paper from Justin Sonnenburg who notes that there is seasonal cycling in the gut microbiome of Hadzabe hunter-gatherers from Tanzania. Of course there is. The Hadzabe's food changes. You can see here they say the Hadzabe's activities are largely based on food acquisition. They are affected by local environment and are subject to two distinct seasons. Wet season from November to April and the dry from May to October.