https://wccftech.com/blizzard-battle-for-azeroth-mob-scaling/

Leveling speed, stat squishes and Battle for Azeroth mob scaling are hot topics in World of Warcraft’s seventh expansion, and the game’s director, Ion Hazzikostas, has now provided a clear explanation on how the latter works.

End-game, high-geared players from a previous expansion have always had a rather easy time progressing through the new expansion’s quests and zones, and this isn’t different in early Battle For Azeroth zones and quests. However, due to the game’s new dynamic zones, things will start to get harder around the level 117 range.