Yeah I think GT is being handled weird.
Remember GT5's release? An unfinished mess despite being 5 years in the oven or so. Thats not how you handle a killer app. Imagine if Nintendo releases SMG or MS Halo 3 in such a sorry state. I was so disappointed with that train wreck. With standards on the grid the game looked like dog shit. Not to mention the load times, sound effects, AI.
Then GT6, in the wake of the PS4 release and no way to even play it on PS4. Way to go.
I think GT Sport is actually a good idea on paper. Who needs a new racing game every year? The way Driveclub kept adding content and kept being relevant, thats the way I'd to see GTS go. Driveclub had a poor launch, but it wasn't shy of content, they just didn't have the servers ready or something. Other than that, the game kept on evolving. Both free and priced. I played it for 2 years on and off. In terms of menu design, AI, sound Driveclub crushes GT.
I fear that GTS will be geared too much towards eSports, and their DLC rollout will probably be stupid. Its PD we're talking about. They will be posting their sales which are for some reason very good (GT5 and GT6 seriously underperformed at launch, yet they boast very high lifetime sales). Do they have legs? I don't think I saw them in charts that much. Legs are what Black Ops 3 and the likes have. GT apparently sells about as good as that so they won't change their ways.
Quality wise, the last real good GT I have played is GT3. Which is 16 years ago. GT4 was still okay, but felt kind of redundant.