Taijiquan is one of the big contributors to Wenhsiuquan's technique. The power forms in Wenhsiuquan are based on the forms of Taijiquan and Shaolin Boxing.
My first introduction to Taijiquan's internal strength came from two Taiwanese girls, Wei Jie Ju and Chen Yu Chi. It had left a lasting impression on me. I feel that every martial art should train its students to develop internal strength and to channel qi. I don't think it is necessary to explain why.