Let me ask this, in the example you give, do polearms get a rush attack option RAW when you equip them? Because I think that the Rush Attack ability was something implemented by Larian.
![[Linked Image from i.imgur.com]](https://i.imgur.com/WynrLaw.png)
It looks like Rush Attack on its own provides a number of specific abilities where it confers off-balance to the enemy and moves you forward AND makes you immune to Opportunity Attacks. I think adding automatic Advantage to the attack roll from reckless Attack feels like it would be a step too far.
Do you have another example that may make more sense?