1. Less communication - When you play online, you cannot communicate and socialize with anyone because there is no interactions happen.
I will disagree with this one. When I usually gamble, I always open two tabs; one for the game itself and one for tracking the chats of the people since I like to read what is happening and whose tipping who. A lot of kind gamblers are just always there tipping you so I always lurk in there waiting for a good Samaritan. I guess this depends on the gambler but for me, I don't gamble without the chat box open.
1. Time Wasting -It is not like online games that you are responsible when and where to play the game, so in a real casino, you need to go to the casino to play the game.
Another thing is that if you will be gambling, you went to a casino, you never go there just because you want to gamble but you want to spend your time in there. How is that a waste of time? You should be responsible so if you want to gamble in the casino, go for it. It is not a waste of time, you want to gamble; that means you want to spend your time either in a casino or a online gambling site.