Not only is most of the public ignorant about the gut biome, most physicians are as well and I agree with your evolving view. My son was diagnosed with abdominal migraines at 11. The neurologist said it would likely morph into regular migraines once he hit puberty, but said “they didn’t quite understand why, only that it was believed to be the interplay of serotonin and sex hormones.” Sure enough that is what happened. The gut impacts the brain without a doubt.