Comparative Red Dragons

First, I love the relatively short 5e stat blocks for monsters. I'm gonna ignore most of the details though and just stick with something that is consistent in every edition and more or less works the same in each.

Here is the 3.5 Adult Red Dragons Ability scores:
Str: 33
Dex: 10
Con: 21
Int: 16
Wis: 19
Cha: 16

Here is the Adult Red Dragon in 4e:
Str: 25
Dex: 19
Con: 22
Int: 13
Wis: 16
Cha: 14

weaker, more nimble, about as tough, and not as bright or charming.

And here we have the 5e Adult Red Dragon:
Str: 27
Dex: 10
Con: 25
Int: 16
Wis: 13
Cha: 21

Little stronger than 4e, weaker than 3.5. Back to 3e nimbleness. Toughest of the three. Not as wise, but relatively smart. Considerably more charming (or more likely awful).

Here's the really interesting note:

Challenge ratings:
3.5: 15
4e: 15
5e: 17

It doesn't look like the dragon got much more powerful, it just seems to have gotten much more relatively powerful.