When you wipe out all of your microbiome, chances are it returns to normal in the following months after antibiotic treatment.

Harmful misinformation. A plethora of citations were already provided that debunk that claim.

You have to take the full course to prevent resistance from forming.

Harmful misinformation that is contradicted by the citation in the article and numerous other citations that I provided in the OP.

If you let resistance flourish, then every single time someone needs to take an antibiotic it will be even more likely they develop a C. Diff infection due to the microbiota being wiped even harder.

This makes no sense. I’ll rephrase it to make it sensical and accurate:

If you overuse antibiotics, every time someone needs to take an antibiotic it will be even more likely they develop a C. Diff infection due to their microbiota being wiped out previously.