First-hand, let me tell you some of my personal experience with Polyphony Digital and the reasoning behind why some content production is slow. For those who aren't aware, I voiced the GT Sport game last year and the narrator you'll hear on all of the Racing Etiquette/Circuit Experience/Driving School videos is myself.
Now, to do this, I had to travel to Tokyo for some of the voiceover work and I had the chance to go and see the Polyphony Digital office in Tokyo one evening at around 22.00, and let me tell you that it is quite large and still had around 30 people working late at that time of night. There are hundreds of people at Polyphony, all of whom put in some incredible hours with one aim: perfection. Anything less is really not good enough and attention-to-detail is everything. Japanese culture is incredibly different to how the rest of us work in the Western parts of the world and the team at PD will quite literally spend days in the office at a time - I really am not joking, as there were beds under desks for people to sleep and get up the next day to start working straight away!
The person who showed me around the offices explained that Kaz has a great working relationship with all of his employees and he believes that this is the reason for the quality of GT. His trust in the people who he works with is crucially important (and is typical of culture within Japanese companies) and that is why all work regarding car modelling, track designing and so on is all done in-house. In short, it makes communication easier between people - could you imagine trying to design a code for a track and having the person you're working on it with in America some 14 hours behind? It would be a nightmare!
So much of an emphasis on quality over quantity has gone on with GT Sport to try and bring the franchise back to its core values. If we have to wait a while for cars and circuits to appear then perhaps this will give you a greater understanding why. Perhaps I'm more patient because of this first-hand knowledge, but Polyphony Digital has to be one of the best companies I've had the pleasure of working for and their standard for work is incredible.