You can currently use tooltips for "official" items, but you cannot with CAs. I think it is important to have tooltips for CAs as well since people may want to show off their collections or even show people what a CA looks like that way.
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“I have no idea where this will lead us, but I have a definite feeling it will be a place both wonderful and strange.” ― Dale Cooper, Twin Peaks
I've been especially wanting it to create a "wishlist" of sorts on individual wolves so that I can remember which of the many CA I want to buy, and also see who created it later if it's not currently relisted. I can do that now with breed changes and pattern changes and that's wonderful, but being able to list CA that I want for each wolf in a neat, accessible way would help me a ton.
Support! This is something that is really important for CA shops and wishlists like lilybun mentioned, also helpful when people need a visual example of a CA they don't know