The main idea to make AI with the sky pointer moving opposite direction of the turn is to follow the same idea in all the indicators design. All the instruments are displaying the deviation of the profile required. The same is for the pointer - it is displaying the deviation of the level flight. i.e. which direction a pilot should follow to come back to level flight.
The construction of the AI with the sky pointer moved in the direction of the bank is easier, as also cheaper. This is why they are more popular I think. But if you would analyze instruments on a new Glass Cockpit GA aircrafts you will see the same "commercial aircraft" AI display on Cessna as also on B738.
If you want be never confused by the information indicated you should never use your GA instrument reading experience flying a commercial aircraft. It is very simple in reality.