This particular topic is common on blackjack websites. It's like the average player just can't get it. IF the "pro's" would learn to sim on CV Data they could easily identify the answer.

IF you are in a position of power, play two hands. If not? Play one.

The dealer has two options hit up to 17 or stand on hard 17. The player can split, double, hit or stand and get 3/2 on blackjack. So, if a deck is rich in 10,As who wouldn't want to spread their investment and play 2 on 1 against the dealer.

A poor deck composition may be a different story. But there are only like 5 players in the US that understand deck compositions.