If by understand you mean that I see it posted numerous times a day across multiple threads and news articles, then yes, I understand.
No, but understand I mean comprehend why someone might feel that way.
I can understand why people might be satisfied with GT6. I'm not myself, but there's a lot of good to the game and I can see how people to who those parts are very important would be entirely satisfied with GT6.
You don't seem to be able to comprehend why someone might be less satisfied with GT6 than you. It's called empathy, and it's useful.
Place more emphasis on the if. GT5 was supported for what, 3+ years, and I can't see GT7 releasing for another 12 months. There is nothing outside of this thread to suggest PD is dumping GT6. Quite the opposite actually, if the news page is anything to go by.
You're quite right.
However, there's reasonable doubt that the features are going to be out within 12 months. It seems impossible for the VGTs to turn up within the stated amount of time (it seems impossible for them to turn up even by the end of next year, at the rate they're going). We've been hearing that the course maker is near complete since before release, and I'm not sure I've heard anything about B Spec or the rest of the community features.
The difference with GT5 was that it included all it's advertised features within a very short time after release (bar things that never turned up, like matchmaking). Almost everything that was included in the support of GT5 was over and above what customers had been advertised when they bought GT5.
At some point, they're going to have to move a significant proportion of their staff on to GT7, if they haven't already done so. Thanks to Polyphony's somewhat less than wonderful public communications, the consumers have little idea to what extent this has already happened or is planned to happen, and what is planned to happen with the GT6 features for which they paid.
I don't think it's odd that after 12 months, people are starting to get a little uncomfortable and question whether the features are actually going to come. I have no doubt that Polyphony intended to provide everything they said they would, but this may come to another situation where it goes on too long and Sony puts their foot down.
It's fine for people like you who are willing to trust that Polyphony will deliver everything that they've said. But exercise your new-found empathy to understand why some people might not be willing to believe that without doubts. It's not even a matter of taking Polyphony at their word, they've been deliberately very vague recently about what we can expect. "Major updates still to come" could be just about anything, and there's still the danger of Polyphony having their hand forced.