Sorry, what? Since when are polearms not popular in 5e?? I don't care about optimal builds, but paladin/fighter/barbarians/hexblades with polearm master, great weapon master and sentiel is objectively an extremely powerful build. Its far better than two-handed sword in everything but damage dices (glaives still have a 1d10), but you actually get a bonus action attack and a reaction for anyone that enters your reach (10ft - which means most enemies can be hit before they even can his you back - combine that with senitel and many won't be even able to hit you on their turn).
And no - no polearm in 5e is a DX weapon.
