You can't just arbitrarily decide "take out the parks and the freeway ROW": that's how these neighbourhoods were designed. Huge, huge ROW, lots and lots of green spaces, and comparatively fewer paved surfaces. Less paved surface = more room for everything else.
No, no, Tuscany does not have wider roads. Road widths are standardized; they might seem wider but they're not.
Larger lots, true. Which goes back to what I said about the fact that gridded neighbourhoods can have lot sizes that change over time: divided, infilled; combined, multi-family, multi-storey, etc.
There's no argument from me that Tuscany has fewer dwellings per unit area than Hillhurst does but that was not always the case. Hillhurst was once much less dense than it is now.
I know... that's why I said:
On the overarching points I agree with you entirely. On the point of curvilinear road networks (generally) having less paved area than a gridded network, I disagree with you entirely. It's absolutely true, despite your perceptions to the contrary. And that's absolutely why they get built like that in the first place: developers don't need to lay down as much road and
for a given lot size the curvilinear street neighbourhood will have more dwellings per unit area than the gridded one.
(And again, the great thing about a grid layout is the lot size is easily changed, you can fill in those neighbourhoods later, blah blah blah, rehash of what we've both said about four times now.
)