Edit: Posted cmt on wrong chapter
The idea of splitting party in 3 roles is fine, but everyone follow that setup? MC said he ended up in the "supporter" role meaning everyone there thinking a team MUST and can only have those 3 roles. That just feel really dumb, considered attacker can be Archer and Wizard or Swordman and Juggernaut, a team can have 4 attacker like that and be just fine.
For example Archer/Wizard can both be "supporter" & "attacker", not just "attacker" or in the MC case, original job was swordman, then he become enchanter for his new role, so he abandoned his "attacker" role to become "supporter" instead of being both?