He makes a valid point. You don't get good at something instantaneously.

Think about how the brain works. When you do something for the first time a simple, crude network of connections between neurons in your brain is formed. If you don't reinforce these connections by repeating the process, these connections are purged. Your brain is just being efficient. If it thinks you don't need some network of connection it will just let it go. On the other hand, if you practice weekly you will reinforce and expand the structure eventually making you an expert.

To reinforce and expand these neural connections even more I suggest visualizing conversations, openings etc you had in the past (do it the next day, or after you get home from the bar). This triggers virtually the same neural connections as the actual act of doing this stuff in reality.

Scientists looked at top athletes and what do you know, surprise, surprise. They tend to visualize and tend to take more (calculated) risk. This forces their brains to experience something new and beyond the current threshold of what is comfortable. Expanding their neural networks.

No pain, no gain and remember science works bitches!