We're well aware of the inefficiency that comes with using referral codes in a long run, thus we're considering the implementation of the referral link to simplify & improve the whole referral process.
Many of our dear users have requested this feature and we'd like to be transparent - we tried to implement this in the past, but then decided not to, due to added complexity at the time.
As our system is improving, so will the chances of implementing and enabling this feature in the near future. We'll keep you posted and greatly appreciate all your support, patience, and understanding.