Knew someone would use this video to state this, even though that is NOT the conclusion of the video.
Counter Fact #1: The Ranger is not "bad" at single target damage, they are currently the lowest, after level 11. This has two points, firstly, the 2024 Eldritch Blast Warlock is still unchanged, and the Ranger is doing well and above that. Perhaps this means the Ranger will be the new baseline? Secondly, and I'll put up a screenshot of the "worse" of the two builds to make this point entirely clear
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The TWF ranger TIES the monk up until level 10. The vast majority of the games of DnD end by level 10, so this covers the vast majority og play, and the ranger is not "bad" unless you are calling the monk bad. And someone a moment ago said they thought the monk was the best damage dealer, so I doubt it is bad.
Counter Fact #2: Treantmonk specifically calls out that he did not take the Dual-Wielder feat, which he states would increase the damage numbers presented here. So, if you take that feat, your damage will be higher than the monks by this point. He doesn't feel it was worth it compared to defense, but that doesn't mean it isn't an option
Counter Fact #3: This build, which is the worst of the three he does, specifically is for single target damage. Rangers have long been known to have a focus on AOE damage. Right at that point where the monk damage pulls ahead of the ranger is when they have access to level 3 spells. This does not include any 3rd level high single target damage spells, which is a problem when calculating single target damage, but it DOES include both Conjure Barrage and Conjure Animals, which are pretty decent AOEs. I mean, sure the monk is going to be dealing almost 40 damage to a single target, maybe you can split that to 20 and 20 against weaker targets. The Ranger can easily deal 20 damage to ten targets with some of these massive AOEs. This is not a worthless consideration when looking at the class as a whole.