Your last 3 posts bring up a lot of good information. I think you’ve answered the questions very well, thanks! I have a good understanding of your approach and see why you disregard common names because of the problematic issues with common names pointed out.
If I had to choose, scientific names only is the lesser of two evils and having a better sense of relationships amongst organisms through taxanomic hierarchy with scientific names is awesome! Only evil because it has problems too: