I also found it quite frustrating that almost no one I ended up speaking to at Comcast knew that this downgrade had occurred.
And I spoke to many during the process of getting out of my contract* because of this downgrade; none knew, neither the front line Customer Service reps, or the Comcast Corporate rep I talked to after filing an FCC complaint. They all suggested I simply had to set my DVR to output 1080p. None of them admitted to understanding that my issue was with the downgraded delivery to my residence of 720p instead of 1080i, and the major loss of resolution due to the resulting two lossy scaling operations: from 1080i (as they recieve from content producers) to 720p (which they switched to delivering to my residence), and then from that 720p to 1080p (by my DVR or HDTV, at my option).
Thankfully, though the Corporate rep didn't understand, they did let me out of my contract (and fixed my monthly rate = the contract rate for a year to give me time to switch to a competitor).
*1-year contract which, 'coincidentally' Comcast had never before asked me to enter into until not not long before the downgrade.
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