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Over and over again, almost every monster is nerfed or changed into something NOT D&D so that you can play the encounters with party of 4. I know because I've tested it by recreating the scenarios with tabletop. The encounters are built for party of 6, not 4. THAT is why most monsters don't behave with their proper stats and abilities.
So, then where's the problem? There is no law/treaty which dictates the game to be DnD 5e PnP with a party of 6. It's a video game with a party of 4 based on the DnD world and implementing (after what I've read from others, as I'm no DnD player) only about 80 to 90 % DnD 5e rules, not everything. They have to rebalance the monsters, and they have done it mostly in an entertaining way, for my taste.
