This question probably goes back to the beginning of counting. Thorp's book may need to be checked.
When did the idea of TC come about? ,was it considered from the beginning? If not I think it sets up an interesting point in the history of card counting.
As the casinos added decks to bj play. It seems there were 2 ways to go, develop RC systems or TC systems.
How easy could it have been to have gone with RC systems and they would have become the backbone of todays systems. I do think TC systems would become developed because they are stronger? in multi deck play. Perhaps they would have been developed in this alternate history about the same time that RC systems were developed in the real world.