This is the branch of the CMA that, usually quite deservedly, comes in for the most flack. Tai Chi Chuan in particular is famed for the proportion of its practitioners who are deluded, out of shape new agers who never spar or do anything 'alive', and many would themselves not class what they do as a martial art.
There are people here who do IMA and do condition and do spar/fight/wrestle. This is the thread to talk about it in, including non-CMA people who want to ask about it.
'Why don't you spar' has already been dealt with elsewhere. The answer is 'some of us do, and we're just as bemused about the rarity of that as the rest of you'.
Deeper questions please.