Absence of evidence is not evidence of absence. We have pretty strong data that suggests that antibiotic exposure is associated with negative health outcomes. For example, patients who had undergone antibiotic exposure within a 6 month period preceding their admission to the ICU had a 20% increase in mortality rate.

Another study [1] I just found showed that older women who had been exposed to antibiotics for => 2 months had increased risk of all-cause mortality and cardiovascular mortality (hazard ratio 1.49). Interestingly, if they had also been exposed to antibiotics in middle-adulthood, their mortality rate was even higher; which may suggest that antibiotic exposure permanently impairs the microbiome. Paper's conclusion: "Long-term use of antibiotics in late adulthood may be a risk factor for all-cause and cardiovascular mortality. The unfavorable effect of antibiotic exposure for subsequent risks of deaths due to chronic diseases needs to be considered."

[1]: https://pubmed.ncbi.nlm.nih.gov/31842690/