While I would never argue against getting more circuits, I think the game's biggest problem is that we don't get to use the ones we already have. Kyoto for example is a circuit I used loads in GT Sport, but we literally only have one race for Japanese 4WD cars - that's a pretty small pool of my garage to choose from if I want to race there, and it's not even included in the Asian or World championships.
There should be enough races available in campaign mode that I should be able to tune up any car I want and have plenty of options of what to do with it. Why can't I race a MR Ferrari at Kyoto? Or Mount Panorama? Or St Croix (if it doesn't have a turbo)?
Lake Maggiore is one of my favourite circuits, but my sensibly-tuned-road-car options are Ferrari or Porsche - I can't race even race my Alfa or Maserati there unless I want to bimble around with the superminis in the Sunday Cup.
They'd have been much better off having a load of FF, FR, MR type races open to cars from anywhere, then having region-specific races for cars of any layout, rather than limiting choice so drastically for each of the far-too-few races. PD's choices with this game, as always, are quite baffling.