Faolyn
(she/her)
As others have pointed out, once you get to the level where ogres are actually minions (in the normal sense of the word), they're not only not actually a real threat, but you're doing enough damage regularly that you're going to be wiping them out in one or two rounds anyway.From previous posts you like narrative conceits driving play for more than I do. If I want enemies that they can kill left and right I can still do that in 5e, they just aren't going to be minions.
As far as Bard killing Smaug that was a narrative contrivance. Tolkien needed some way to kill off a legendary dragon.
Different approaches to game design are going to appeal to different people.
Like, I just did the math here. My current 5.14 character is a rogue (swashbuckler) 9/fighter 1 with a +1 rapier (with an extra +1 to damage from other sources) who acts as a front-line fighter most of the time. When I get sneak attack (which I can do a lot, since swashbucklers get them in 1v1 as well as the normal ways), I'm doing an average of 27-28 damage. A D&D 5.14 ogre has, on average, 59 hit points. Which means that, if it were just me and that ogre, I'd be killing them in two rounds. The fighter, monk, and casters we have do a lot of damage on their own. Most of the party has much better Dex scores than the ogres and so it's far more likely we go first in initiative, and while a greatclub can do a lot of damage, we can generally soak it if we get hit in the first place.
(According to WotC, 16th level in 4e, which is what that adventure's adventure was apparently for, can be converted to level 10-11 in 5e, so we're about equal, although I have no idea how to convert those ogres' AC of 26~.)
So really, what's the difference between these ogres and minion ogres with 1 hp? They barely last longer in 5e with 59 hp than they would have in 4e as 1 hp minions, and they're going to hit just as hard if they do manage to hit.