Tai chi emphasises sensitivity to a high degree.
So when you touch someone, you should be feeling their root, the connection to the ground. When they touch you, they should not be able to feel you.
Not everyone chooses to delve into this aspect. A lot pay lip service to the concept. Because frankly it is hard. It's painful. The Chess player Capablanca said you had to lose a thousand games before you could start winning. Cheng Man Ching talks about investing in loss. Few are prepared to undertake this journey because they want to win straight away.
Sensitivity needs to be balanced with strength.in order to be able to take it. For me standing in San Ti posture works on developing both aspects.