including the above anecdote.
2) UHS - they aren't slow anymore.
If you believe that, I've got a bridge you might want to buy
Those specs are only for new or blank cards. Once a SD card has had images written to it, then the card must be erased one block at a time, and that's a very slow process. You basically go back to 10-20MB/Sec, not the high speeds you see advertised. Its a sucker bet.
You can do a card erase or low level format to restore them to new status and get that speed back, but few are willing to spend the time to do that, it seems to take forever for a low level format of a 64GB SD card..