Don't think the Kindle Fire HD supports OTG, but then again the N7 doesn't natively either without rooting. There is however a great app that allows OTG support (albeit one-way) without rooting. Good luck with Amazon making that available in their "personalized" version of the Play Store. And where's Amazon OS's version of security that allows you to side-load apps? Don't hold your breath.
Don't really mind much that opting out of Amazon's home page ads (not ALL ads mind you) costs $15, that's the cost of doin' business, but the lack of GPS and other vital sensors is the deal breaker for me. I say this as true fan of Amazon and Amazon Prime. They've made tons of money from me (I've got well over 300 Amazon books now), but I just hate being married to one vendor's infrastructure, the their ultimate determination of what they'll allow me to do with a device I purchased, loss or not.
Don't really mind much that opting out of Amazon's home page ads (not ALL ads mind you) costs $15, that's the cost of doin' business, but the lack of GPS and other vital sensors is the deal breaker for me. I say this as true fan of Amazon and Amazon Prime. They've made tons of money from me (I've got well over 300 Amazon books now), but I just hate being married to one vendor's infrastructure, the their ultimate determination of what they'll allow me to do with a device I purchased, loss or not.