I voted no because cars changing yearly is standard practice in this industry.
The frustration with Tesla can be that they change within months, with no method of predictability. With the rest of the auto industry, the changes happen every model year. One year they don't offer rear view camera the next they do. You know that if you buy a new car in July, the next model year vehicle will be released fairly soon with their incremental changes (typically a few more options and performance upgrades). With Tesla you have no idea when they'll do these incremental hardware improvements (such as 4G). The obvious, and significant, advantage to Tesla, tho, is the OTA updates. Fair trade off in my opinion.
But this thread is about big upgrades. I consider the 'D' a big upgrade. I confirmed my order for a S85 days before the D announcement. I was, indeed, pissed. I had held off for so long because I wanted AWD, then I finally convinced myself to get it anyways. Now, Tesla allowed me to change to a P85D with no problem, so I wasn't angry long, but had I convinced myself get a RWD car a month earlier yes I would've regretted it.