Hmmm...I would say it a bit different. Don't get anything in crepe sole if your intent is to wear it 100% of the time in formal/dressiest of settings. Alden's black crepe is fine for wool trousers/sportcoat, dress khakis/ navy blazer and below. May even be fine for more casual suits. Anything dressier than no for crepe.
We'll have to agree to disagree. For me personally, a crepe sole disqualifies a shoe/boot from formal and business casual. If others see if differently I have no problem with that.