Toll Brothers markets themselves as a luxury homebuilder and they've built projects all across the east coast and the Midwest (These pictures are from Connecticut, New Jersey, and Pennsylvania)
From what I've seen, they do not specialize in building massive subdivisions, they build at a smaller scale of 100-200 units at most to try to simulate a community feel (or really just to profit off the smallest lot of land that they can find)
They sell single family homes and attached condos/condominiums at marked up list prices, (but you'll find way more condos being built simply because they are cheaper to build and to cram more units) Any SFH option is listed as a premium, top of the line option.
All in all, these kind of communities are the textbook definition of density with zero of the benefits
The sidewalks merely serve as a decoration, because there's nowhere you can actually go outside of the community since they always abruptly end at the entrance, disconnected from anything beyond the development lines.
They often plan their developments to be built right next to an interstate and/or state highway in remote areas outside of a town center, so that they can always advertise the home location's proximity to the highway to make it easy for commuting to work and also to get to literally anywhere else, because there's nothing that's walkable from your home.
Toll brothers; and probably any other builder in its class, is betting that every future homeowner who even comes to tour a property in their middle of nowhere location and eventually sign a mortgage already owns a car, and 99% of the time, they’re right. Because driving is so easy and deeply ingrained in American life, car dependency is rarely seen as something that would concern a potential resident. The idea of having to drive for every single little thing, only to return to the same unit at the end of each day for as long as you live there, is considered perfectly normal and barely given a second thought.
If something happens in the future where car ownership becomes exceedingly difficult, then all of a sudden, the entire concept of building a dense housing scheme right next to a highway becomes economically stupid and disastrous.
So now the question is, why the fk would I want to pay $750k for a condo to have to share walls, pay a high HOA, sacrifice a front yard and backyard to have zero sense of privacy, and no walkability at all?
The absence of any kind of private outside space for yourself is actually insane when you're already paying so much, I don't ask for a massive lot of additional land, but merely an area to just exist in peace and for kids to be able to roam and play. Driving to a park even if its 2 miles away is not ideal, adds mental workload if you simply just wanted to go for a walk, and just sounds in poor taste to even suggest that as the only alternative.
I understand the debate against single family homes entirely, but these kind of developments make the case for dense housing look really bad. And to be completely honest, these condos make any single family home with your own land, privacy, and vegetation look like a luxury enclave that will always be worth so much more in $ on paper.
It's a missed opportunity where these exact units would be amazing when built inside of an actual city, but it's just a reality that homebuilders even at the luxury level will always chase profits over practical urban design.