Well Promo is miraculously generous, including everything AFAIK, apart from 2500 pic limit - which is quite sufficient on its own to ‘cripple’ Promo for the power users.
Promo means Promotion - to enlist lots of small users to RC by empowering them with all of RC’s wonderful features, and to support them, as many as poss, to develop into power users, where the real money is.
Being denied Coded Markers is foolish, will not incentivise me to buy a full license. That will only come by continuing to support me to the max.
Maybe there’s a ‘good’ technical-incompatibility reason but I doubt it.