Peach1, there is another company that sells various plant milks that do not have emulsifiers and gums. The company is called Joi
So if you use their plant milks, you don't ever have to consume emulsifiers/gums. Here is a link to their website:
https://addjoi.com/collections#data-plant-basesTo answer your question "should all emulsifiers and gums be avoided due to their potential negative effect on the gut microbiome?", I personally don't consume them. I think it depends on how often you consume them. If it's every once in awhile, I wouldn't worry about it. Since there are plant milks available that don't have emulsifiers/gums, I'd choose those if you have concerns.