FormerlyHemlock
Hero
I don't think it's all that different for reasons of proliferation. I think that some might dislike it because magic has been brought down a few pegs over the course of editions. Sleep, the low-level "I win" button of 1e and 2e now grants a saving throw. Polymorphing an enemy into a toad isn't an invitation to a beatdown, since it will break on the first serious injury. I appreciate the nod to balance. Magic doesn't have to be "I win" to be magical in my book. Granted, anyone who expects it to be so may be disappointed.
In 5E, Sleep has no saving throw. Only a 5d8 HP limit. It's very AD&Dish in that respect.