He does....if by start..you mean 9 freaking minutes into this thing.
Firstly Treantmonks "Base Damage Benchmark" is the average damage of a Warlock casting Eldritch Blast against the target of their Hex spell.
So his complaint is the monk class, by consistently failing to match the
tedium of this DPS combo, sucks.
I play D&D for memories. A series of Pew Pew dice rolls from an Eldritch Blast/Hex combo is probably going to be forgotten in 5 years...it is D&D empty calories...dice rolls in the ether.
Monks score low on DPS but score High on ECS...
Effective Cool Score.
The monk at it's best, embraces Wu Wei, and picks the right moment to strike, to nova, to shape the course of the battle.
The monk, gets to be effective and cool.
Treantmonk stated that Stunning Fist is a poor option because when a 5th level PC group is fighting a group of CR 5 monsters, just stunning
one monster is too limited an impact.
That
is absolute nonsense.
Treantmonk has no measurement of timing, it is just anonymized raw DPS data.....which is not how D&D is played. An RPG is very particuliarized....
Now that said, Monks have huge MAD issues: STR(Jumping, Grapple) DEX, WIS, and CON.
Monks also really need Magic Items...ironically. Bracers of Defense and Gauntlets of Ogre Strength come to mind. A Flametongue Monk Glove that works on unarmed strikes would be awesome.
Monks are also going to want to meditate for an hour after a nova. As a DM placing a few QI potions, or a expendable magic Sutra that boosts Monk DCs or a scroll that activates say a Jump of the Wind without a Qi point cost, (similar to a spell scroll), can help out monks if you feel they are underpowered.
Boosting the Martial Arts die via home brew feat or Supernatural Boon, won't hurt either.