Kind of dumb if you ask me. Admittedly, having Matt Murdock be able to take out the top Ninjas en masse is far worse though. This guy was trained for like 2 years at this when he was a kid and has been a student hanging out for years, occasionally beating up a heavy bag. Danny Rand at least spent 15 straight years in 20 hour a day kung fu school getting the beat out of him. It's a lot more believable that he might be among the best of the best. Not to mention, this becomes a big theme of the second season, Danny being an undeserving outsider, etc.
Maybe they can complain that the 40+ year old comic was a white washing, but it seems silly to demand an asianification now. And in the world of comics around the same time Iron Fist came out, MOKF came out, so you arguably had an Asian be "the best there is" at this stuff co-existing. But bringing Shang Chi into the Netflix shows would be a bit much. (They'd also probably have to remove his mother being white from the background story). Anyway, they want him to be a movie star, not a netflix star. With that said, the Defenders could have been stitched up nicely if Shang Chi appeared in it, as a martial arts government agent hunting down the Hand.