I don't think I'm missing the point of how FM optimizes. If anything I think you missed my point. I'm well aware that to Turn 10 framerate is god, and they'll always favor that over the addition of bells and whistle or new features. That's exactly why i think it's not really worth putting out a forth Forza Motorsport game with the same base-level hardware. What do you envision a Forza Motorsport 8 providing that differentiates it from what could just be FM7 with some additional DLC? For FM6 this was the addition (or re-addition) of night racing, along with wet racing. For FM7 this was making ToD and weather dynamic... however because of the current limitations of how the engine handles lighting, and the requirement for the game to maintain 60fps on the standard XB1, the dynamic nature of these elements is notably limited, and shadows look largely worse/simpler than they did in FM6 because they need to effectively blend between the ToD states without actually being able to change positions. So, with the understanding that the game will still need to target the 2013 XB1 hardware, and that it'll need to maintain a 60fps lock, where does FM8 go from here? It's pretty much guaranteed that any other major feature additions would come with caveats, and potentially tradeoffs compared to earlier entries that needed to do less.
That's why I would prefer the series sit a year (or even two) out so there would be time to work on the foundation, rather than continue building on what's becoming a technological Jenga tower. I'm especially worried that about the possibility that a shorter development time for the nest generation would result in Turn 10 mostly carrying the current implementation over, only a little jazzed up. In both of the previous generation transitions the first FM game released lost a lot in regards to content and/or features (night racing was in FM1 for example). In FM2's case this was balanced out by the jump from 30fps to 60fps... but FM5 on the other hand simply seemed like a victim of a short dev cycle, and FM6 is effectively what a sequel to FM4 should have looked like. FM7 now feels like somewhat of a 6.5 upgrade, hinting at the dynamic elements that make sense as an evolution from FM6, but the hardware has effectively limited it from being properly impletemented. Maybe FM8 could realise this fully, but on the same level of hardware, I don't consider it to be very likely. I'm not arguing for the game to compromise its stable framerate for better graphics... but if the main difference between FM7 and FM8 ends up being its tracklist, then why is it a numbered sequel at all?
In regards to comparing GTS and FM7's sense of speed, that would almost certainly owe more to stylistic choices for FM's FOV and camera warping. The framerate wouldn't have a lot to do with it. I jump between FH3 at 30fps on console and 60fps on PC, sense of speed is basically identical despite an obvious different in fluidity.
ok, let me get this straight... (and I will leave alone for now everything you wrote about shadows etc although I dont agree)
- the old xbox is the reason that forza motorsport should take a break next year, because limitations of hardware, while
- in the slot of next year's forza 8, a ...new franchise should be introduced, one that will of course be bound by the same h/w restrictions?
and how does that make sense exactly?
then, you basically say forza 5 got victimized by turn10 because content, but fail to realise the great jump in physics and response, i.e. what is the foundation of racing (let alone jump in graphics etc). I suggest you go play some forza 4 for reference. I also had the nostalgia googles on like you.
also stuff like F1 cars, openwheelers in general various types of vehicles where introduced in f5, types that old engine could not handle. (edit: thats gameplay expansion for simmers).
also I think you miss the fact that five years in, and we just now entering a phase were other racing games offer as much content as fm5 offered day 1 this gen (200+ cars day 1 of gen,
fully customizable, laser scanned tracks, online/single player, lots of dlc).
furthermore, you are also missing the fact that the most praised forza ever, forza 4, it was released on the 6th year of console's life, not the 2nd (forza 2) or the 4th (forza 3).
in fact as you correctly wrote, they had various things with striking balances, until they had the time to sort all out in fm4 (example forza 3 sound did not upgrade with engine upgrade).
and 6th year of this console life, is 2019, just in time for fm8.
and about Forza Motorsport 7 feeling like Forza 6.5, well, not if you have a scoprio it doesn't, yes? ;)