However in addition to Nick, the Monk also gets weapon mastery in the light weapon that is not Nick, meaning the multiclass is ahead even on the rounds where the 2nd level Monk would use FOB.
Fair.
Though it needs to be a light weapon, and so probably Vex.
And it isn't useable with flurry of blows.
So call it advantage on 1 attack after level 5.
Though level 2 monk also gets +10 speed.
No he is not, he will be ahead the whole game.
They will always be 1 flurry of blows / stunning strike behind. Which is better than advantage on that 1 attack for that round, worse on others.
At level 3, Deflect attacks is much better than an additional weapon mastery.
At level 4, +1 Dex (assuming 17-> 18) is a better than an another mastery.
At level 5, multiattack and stunning stike is way better than an extra mastery.
At level 6, ... hard to judge.
At level 7, Evasion is better than a mastery.
At level 8, +2 Dex is better than mastery.
At level 9, mastery is probably better.
At level 10, Heightened discipline is way better than mastery. Plus another 5'.
So straight monk is looking better at most levels. IMO.
I don't know that 15 will be the requirement for heavy armor,
Armor hasn't changed. So you need either some Str or some Dex.
but even if it is, the investment for a 15 and maxing strength is significant and more so when you consider the Paladin aslo uses Charisma for his aura and spells.
For paladins. Yea. A hexblade dip is still good, but less so than 2014. It depends on which feats your taking.
17 Str Polearm Master + Great Weapon Master + Charger = 20 Str. No need for Cha.
Or again, Magic Initate (Shillelagh) lets you attack with Cha 1 handed.
You can get better Feats, bump Charisma and not lose any damage.
Weapon feats don't bump Charisma. They bump Str or Dex.
Now if your doing sword and board with Inspiring Leader, Resilient (Con), Defensive Dualist. The sure. You can dump Str, stick with medium armor, and dip hexblade.
On point buy: Start with a 14S, 17Charisma
Then take GWM at level 5 (boosting strength to get your plate) and then get a Charisma feat to do more damage than you would with PAM while also having a higher Constitution.
You're not doing more damage compared to starting 17 Str and 14 Cha.
You are improving your save aura though.
You actually get GWM three levels earlier (level 5) because you would not even get PAM (your martial arts attack does more damage than your PAM bonus).
So the paladin is dipping both monk and warlock?
Then you don't have GWM or multi-attack at level 5.
Note, GWM doesn't work on bonus attacks. PAM or monks.
Also PAM works great in a white room, but in play it ties you to a few weapons.
Push + reaction attack is a great combo, available on Glaives.
Everyone I have seen play PAM has eventually switched to a staff or something that did not work with it at all, because there are not many really good magic Glaives or Halberds in most campaigns.
i always run home brew campaigns, and rarely gave our magic items.
If you want to use it in play you are probably going to eventually switch to a staff because there are not many weapons that work with it besides staff.
Staffs work with Shillelagh.