Sacrosanct
Legend
Those are extreme examples though. .
No, not really, because it exists along every level range. Ogres appear in level 1-3 adventures. Even a 3rd level MU is only going to have 8 HP, and a thief 11. So even at 3rd level, a single hit by an ogre may kill them. The MU at any rate. Dead. Gone. A ghoul only has 2 HD, and has 3 attacks fro a total of 3-14 points of damage not even counting paralyzation. More than enough to kill equal level PCs in one round, even fighters. Owl bears? a 5 HD monster? 4-24 points of damage in one round. That's enough to take out a 10th level average MU, let alone a 5th level one. Giant scorpion? 5+5 HD and can do 3-24 points per round, not counting save or die poison. There are many examples, along every level range. So no, it's not an extreme example.
5e does a lot more damage, but PCs have A LOT more hit points. You don't get a HP Con bonus unless your score is at least 15 in AD&D. A 12 in 5e gives you a +1 bonus. And only fighters could ever get more than a +2 bonus, but that required a minimum 17. In 5e, you got a +3 bonus at 16. The hit die also increased. A MU used a d4 in AD&D, and a thief used a d6. That went to d6 and d8 respectively. In 5e, you start with max HP, not so in AD&D. In AD&D, you stopped rolling for HP at level 9, and only 1 or 2 hp per level unless you were fighter, where you still only got 3 hp level and that's it.
So a 10th level MU in AD&D would have 24 HP, while a 10th level wizard in 5e would have 42; 52 if that wizard managed to have a 12 in his or her Con score. HP in 5e increased at a greater rate than damage did. Ergo, by ratio, attacks did more damage in AD&D than they do in 5e.