It seems that feature has not yet been included in the VERY new version 1.1
If Adobe waited to release Lr CC until it satisfied every users wish list, it would not be released until around 2022
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You can vote here as a feature request:
Yes, the import dialog is basic at best.
What I've been doing is opening the card in Windows/uploading the whole card to a RAW dropbox file. Then I go from there, identify photos I want to keep and move only those into Lightroom CC. I am not keeping all my photos in CC either. WAY too little storage and I pay for other storage so...
While in the import window, you can just press 'e' on your keyboard (shortcut for 'expand/enlarge') and the photo will become larger. Then, you can use the shortcut 'p' to select a photo and 'x' to deselect a photo. (I'm not sure which version of Lightroom I'm using...)