1. The Nexus line is supposed to be something like Google's Android reference device, and implements the minimum common set of features -- up-to-date computing hardware and screen, reasonable-resolution cameras, standard set of sensors (GPS, acceleration, etc.). An SD card slot doesn't really add any technical possibilities.
2. Google probably wants to push the idea that any storage beyond local apps should be to the cloud.
(which is comically unviable in Canada, where you're paying $25-50 per 1 GB of mobile data)
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I recently got a Nexus 5 after a long search for a replacement for my stalwart iPhone 3GS. The lack of SD card was the primary sticking point, and caused me days of choice-agony. In the end, price and "cleanliness" (stock android, lack of shitware, doesn't fight software customization very hard) won out.
2. Google probably wants to push the idea that any storage beyond local apps should be to the cloud.
(which is comically unviable in Canada, where you're paying $25-50 per 1 GB of mobile data)
---
I recently got a Nexus 5 after a long search for a replacement for my stalwart iPhone 3GS. The lack of SD card was the primary sticking point, and caused me days of choice-agony. In the end, price and "cleanliness" (stock android, lack of shitware, doesn't fight software customization very hard) won out.