Not by modern American standards. It can work with more casual suits and anything business casual.
I'm not usually one to debate these things, but once you start saying things like "by no standard" you are being ignorant if not misleading. By your standard, fine. But not "by no standard." While to purists, it is deemed unacceptable to wear longwings, bluchers, and perhaps even shell cordovan altogether, most men in modern society (99%+) don't give two shits whether traditions are being followed.
Regardless, several modern day designers, such as Paul Smith, Thom Browne, Tom Ford, Mark McNairy and others, disregard convention, or else follow the "standards" very loosely, and find their work very popular in the business environment. I can walk into any boardroom meeting with any color LWB (except whiskey) and I guarantee not one person will notice. Except maybe the guy who spends more time analyzing his shoe collection than focusing on his career - but he's probably too busy fetching our coffee.
The LWB is a very versatile shoe, and especially with dark edging, is quite appropriate as a business shoe.
Bad news from Shoemart on my irregular order:
I am emailing regarding your recent order with TheShoeMart. Unfortunately, while, at the time you placed the order for the ALD_9_D, our computer system showed that we had this item in stock, we actually do not, as it was an inventory error. Our inventory system is usually very accurate, but, unfortunately, on occasion, it may show that we have an item in stock when, physically, we do not.
Since this item is not available, your order has been cancelled, and you will be credited for it in full today. We do apologize for the inconvenience and hope to be of more assistance in the future. If you have any questions, please feel free to let us know.
Does this happen often?