One stupid design issue that I encounter from time to time has to do not with the product itself, but with branding.
Businesses/shops/restaurants in Western countries adopt legal names that are written in the Latin alphabet (with diacritics as necessary). That way they get their business name registered, get into directories etc. - I often search for a specific business name in Google Maps.
Then, they have some hypointelligent graphic designer put their brand (which, remember, consists of a sequence of letters in the Latin alphabet) in a graphic form that cannot be reliably decoded as a sequence of Latin letters.
They simply cannot seem to realise that customers will need to look at the name and (1) talk about it to others or (2) write it down or (3) search for the name.
One example, that I encountered a few days ago at the front of a midrange fancy restaurant in Stuttgart, Germany:
(please click on the picture to see it uncropped)
Looking at that form of the name, I would not been able to pronounce the restaurant’s name, and I would not have been able to search in a map app on how to get there.
My first hypothesis was that the first two letters were Greek or Cyrillic (the two glyphs exist in both scripts), and the last two Latin, which would have made the restaurant name read PLLO - that does not make sense, even in Swabia.
I could not let that riddle go unresolved, and bearded the bar keeper in his den. He answered that, of course, the establishment’s name was MALO.
In a similar vein, when I first encountered the chain Toys “Я” Us, I assumed for some time it was pronounced Toys Ya Us, and was puzzled by that choice of name (I have since learned that the legal name is in fact Toys “R” Us, which makes sense as you probably cannot register a business in the US with a Cyrillic letter in the name) .
A few years ago we dined in a nice restaurant in a side street in Strasbourg, but I could not find it again two days later because I had not seen what it’s name was - its name was so skillfully obfuscated on the front that I had no idea how to render it into letters, and I had not thought to ask. I had the credit card debit record but that only named the proprietor.