You can see what they get from the character screen 1 skill 4 weapon proficencys and light armor. Most of that is heavily useless for a large number of classes.
Light armor not really great when you can be gith or shield dwarf and its strictly better. Skill has low value. Pole Arms proficency has really low value to the classes that might take advantage of it since the melee classes that would use it and get a benefit already have the weapon skills to not need it. Paladin / Monk / Fighter / Ranger / Barbarian - dont have the skill or really there is almost no value in having a proficency in them as a weapon. Wizard / Sorcerer are generally not in melee. Clerics may take advantage of it. Druid is going to be shape shifted or casting. This Leaves Warlock and Bard. The bard does not get weapon skills that benefit from using a pole arm so its more a flavor choice. Warlock may use it but again I dont see them being a heavy melee build especially with a lack of armor proficencys unless you want to give up your ASI's.
Yes a monk can use the proficency but they only get the dex to damage on MONK weapons. So zero use. Even if they changed that your giving up ASI's you need on a monk to take advantage of it.
Monks Paladins and Bards frequently want there ASI bonus.
