Okay? I don't see the comparison. Like, yes, it can fail. Gnolls are pretty notoriously monsters in 5e* though, so you should be prepared for the possibility that they don't speak common.
Meanwhile, we can now have beings that look like humans, move like humans, speak like humans, dress like humans, and do pretty much everything else humans do...and which have been classified as humans...but which are now classified as fey or aberrations or whatever. That's where the issue lies. I don't see any meaningful chance of a rug-pull experience with trying to cast command on a gnoll, whereas I can see that happening frequently with these new "updates."
*Which mildly annoys me. I've never played one and have no intent to start, but it's just...why jettison the cool gnoll lore and gnoll PC possibilities? Particularly in the edition that's been striving to present more nuanced views on frequently vilified races, like orcs and drow!