Just spitballing on some classes that might like it
I would like to know why should theese classes "like" that they got useless proficiency in trade for 3 Ability scores

Humans get both the +2 and +1 and the polarm feat.
Having a proper 10 d weapon especially with reach shores up the melee range power these classes have. There are quite a few classes and architypes that have strong short range spell but dont have good weapons to fall back on.