Here's an example of low level creatures impacting a fight in 5e:
In one encounter the party (Level 17) was fighting a group of vampires. All of a sudden about 16 skeletons with bows popped out of the crypts in the middle of the fight. They were cleaned up, but they did expend a few resources in doing so. And since AC is capped more or less around 19-21 for the players (without magic items), those skeletons still ended up doing about 40 points of damage against the party Fighter. +4 to hit vs AC19 from memory.
In fact, the skeletons did more damage than almost anything else.
Action economy is also pretty critical in 5e, large numbers of low levels can be dangerous. Fireballs and such can help clear them out, but even your average CR2 monster will probably survive a fireball. The net effect of this is monsters in the MM are useful across all levels of the game.
One other interesting concept is saving throws do not scale, although DC's for casters do scale. So that means a Dragon still has +0 dex saves, or a high level fighter can have +0 wisdom saving throw. It makes spells like Hold Person and such extremely potent later on in the game (when caster DC's get up to 16+). Spells can be cast at higher levels to do more damage, or effect more creatures, while saving throws stay flat. The net effect of this is spells are more useful across all levels of the game.
So in 3e/Pathfinder you get a large amount of player options, but they're only useful for a band of levels. The same with DM selection of monsters. 5e on the other hand, the content you do have is useful from level 1-20.
In one encounter the party (Level 17) was fighting a group of vampires. All of a sudden about 16 skeletons with bows popped out of the crypts in the middle of the fight. They were cleaned up, but they did expend a few resources in doing so. And since AC is capped more or less around 19-21 for the players (without magic items), those skeletons still ended up doing about 40 points of damage against the party Fighter. +4 to hit vs AC19 from memory.
In fact, the skeletons did more damage than almost anything else.
Action economy is also pretty critical in 5e, large numbers of low levels can be dangerous. Fireballs and such can help clear them out, but even your average CR2 monster will probably survive a fireball. The net effect of this is monsters in the MM are useful across all levels of the game.
One other interesting concept is saving throws do not scale, although DC's for casters do scale. So that means a Dragon still has +0 dex saves, or a high level fighter can have +0 wisdom saving throw. It makes spells like Hold Person and such extremely potent later on in the game (when caster DC's get up to 16+). Spells can be cast at higher levels to do more damage, or effect more creatures, while saving throws stay flat. The net effect of this is spells are more useful across all levels of the game.
So in 3e/Pathfinder you get a large amount of player options, but they're only useful for a band of levels. The same with DM selection of monsters. 5e on the other hand, the content you do have is useful from level 1-20.
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