[belorn]

The metabolic system is like a ecosystem, where every intervention has a fairly large spectrum of unknowns. Probiotics can do harm, just like antibiotics, or it may do nothing, or it may improve health or reduce symptoms. Generally it doesn't have long term negative effect so it fairly safe, but I can see how doctors would be careful throwing in additional unknowns, especially initially when testing if the antibiotics themselves has the intended effect without major side effects.

We live in symbiosis with the gut flora, and the tools we have to fix problems are crude and based on trial and error.

[nerdponx]

That is true of literally anything ever.

It's becoming clear that the risks of probiotic supplementation to counteract the damage caused by antibiotics are substantially lower than the benefit of actually counteracting the damage caused by antibiotics.

Yes, you can get cramps or diarrhea or brain fog or even SIBO, but that all sounds a lot better to me than intractable c-diff or the growing number of "peripheral" health problems that we now know are at least somewhat related to gut health.