I'm sorry, Dave. I'm afraid I can't do that.
1. The rules do say that. Period.Nothing in the rules state that, and the response in Sage Advice clarifies it as a preference in the lore and not a requirement. You can rule it that way, but it does not say that anywhere.
2. Sage advice is just RAI. So best case scenario, you're still wrong. And you're not reading the RAI correctly (which says you have to ask the DM, just like any other house rule). Bad cherrypicking is still cherrypicking.