There is nothing more cruel to say about Taijiquan in actual combat. If you are young, it is recommended to learn the old frame all the way instead of learning the new frame all the way, because the latter is easy to cause knee injury if the practitioner has insufficient foundation. Middle-aged and elderly people recommend Wu, which is gentle and equally lethal.
Finally, Tai Chi Chuan must have a good teacher, that is, a wise man.