It is unprofessional because they know it's bad decision but are still doing it to cut corners and not spend time.
This drug, needed a planting, its wasn't done in time, probably because there might have been a last minute change in the structure of the narration of Zoro, so Oda did what he could with what he had.
Again calmly, its not to cut corner, its not to buy time, its a simple writing mistake and no, Oda is NOT abusing it. This was his first and only storytelling mistake in hundreds of chapter. So cut him some slack will you. We are not talking about a casual job in a business here.
Stop read hating for the sake of hating