My 2 cents:
1. I think people will be less upset if PD is committed to bringing real Skoda cars alongside the VGT. Throw in an Octavia, the old 1100 Spider and a rally car alongside the VGT and suddenly the VGT's importance diminishes. Right now, it feels like PD is completely oblivious to the brand until a design intern rings them up and says "hello, we exist and here's a concept car to pad Kaz's WipeOut grid. Can we be in the next game please?". Kaz shouldn't wait until a brand announces a VGT to add it to the game. As a car encyclopedia Skoda should've been in GT a long time ago.
2. It's no good saying the VGT will pave the way for future models to come to the game. Look at Infiniti's dealer - only VGT, no sign of G35, G37, G20/Primera, Q60 Eau Rouge. Look at Mini - the newest car apart from the VGT is almost 20 years old. Hyundai - same deal, there are only the VGT and ancient Genesis Coupe and no sign of i20 N, i30 N, Elantra, Veloster. McLaren is mising a dozen models but has 2 dupes of the VGT.
3. If we have to wait for a new concept car to add a brand to the game, where does that leave loads of significant/historical brands? Do we need to wait for a Volvo, Bentley or Lotus VGT for them to return? Would Koenigsegg bother with this marketing spiel when their clients barely play videogames? I don't think so. What about old defunct brands like Venturi or Vector? No chance of them returning. Or even quirky brands like Tatra or Saab. None of them are likely to return if Kaz' awareness and incentive to add them only depends on the design team making a VGT to go along with it.
4. Taking a view of the game as a whole, it's only been 4 months and we've had 3 VGTs so far this year. If you filter the car list on kudosprime by "Vision GT", 54 models falls into this category already. That's 10.8% of the carlist. Meanwhile loads of significant brands are still missing as I mentioned above. The roster of Ferrari, BMW, Mercedes, McLaren, Hyundai, Aston Martin and several others are outdated. We are missing LMH/LMDH other than the Toyota. Gr.3/4 class is outdated. Only one GT300 car that is Subaru. Only one modern DTM car (and the old Alfa). Loads of racing series missing like Super Taikyu, TCR, V8 Supercars, Formula E, Indycar, NASCAR, Can Am. Don't start on the lack of tracks - the last proper asphalt track was over 1 year ago.
Once again it's not that the VGT itself is bad. It's the lack of balance with other actual content that people want that makes people angry, and rightly so. Gran Turismo used to be about the players. Letting us drive cars that we own in real life, or aspire to own. Racing it, tuning it, doing things with it that we can only dream of. Then suddenly the whole brand got big and now it's more a marketing platform for Kaz' ego. Yes GT Academy has been instrumental in letting sim racing be a viable (albeit uncommon still) path to real racing. Yes VGTs have been great in generating interest in brands and influencing the future design direction of their real cars. But these should NEVER come at the expense of the actual game and players enjoyment.
At the end of the day, it's the players and fans that creates the behemoth GT brand as we know today. Without their support from GT1 through 6, Kaz would be nothing. PD would cease to exist. None of these brands would want to collaborate on anything. It's thanks to the players supporting, buying and playing the older games that Kaz got to where he is today. But now, those VERY SAME players are forgotten and cast aside. We are just an afterthought on the company balance sheet. Kaz does whatever he wants now, getting chummy with all the elites in the car world, making deals left right center. And the game? We'll just do the absolute minimum to keep it going. Who cares about adding road cars that anyone can buy, it won't generate headlines. But a shiny new VGT exclusive to the game? Yeah that will bring the clicks and $$$.