PD already focused on that mini style low car count GT racing. It didn't work for the majority of the fanbase. PD weren't allowed(again, by the fanbase) to focus on just the SPort aspect and fine tune it. This is where many wish PD would use their assests to focus on Ai, physics, etc. Instead, the larger fanbase wanted a "real" "full game" GT. Maybe we would have seen better AI, better physics, better attention to the details of simracing(tyre wear, tyre pressure, road surface, etc.), but PD weren't allowed to do that through the outcries of the fanbase.
PD rushed what they gave us in GT League, threw cars at us that have no focused groups and proceeded to try and juggle Sport Mode/FIA, while preparing for the next GT. Seriously, those of us that didn't by GT SPort at debut, those of us that cried for offline content, who knows? GT Sport might have been that focus PD needed to make the franchise move forward. I mean, Kaz said GT Sport is the beginning of the next chapter in the franchise. GT7 almost seems like(until we actually get the game) a soft reboot of the franchise.
Edit: Just read that about no career in AC.
This game is definitely not crap. I haven't touched Career because AC allows me to play the game how I want. I create my own Championships by selecting my car and each car for the AI. I change the names to real drivers and cartoon characters. I pick the point structure, laps and how many races. I choose Practice and Qualifying for my races. It's definitely not a crap game.