Plazas & Promenades allows more walkable Skylines cities, but doesn't play well with other areas

Looks like we're back to seeing 2 Cities: Skylines expansions being released in the same calendar year. Airports released in January, and now in September, Plazas & Promenades hit digital storefronts. I wonder if this will continue now that most businesses (and presumably Colossal Order) are back to business as usual following the COVID pandemic? Or maybe Colossal Order is migrating towards releasing even smaller, more module micro-expansions such as the recently-released Financial Districts DLC (which I'll review later)? Or will we finally see an announcement on the rumored sequel to Cities: Skylines soon?

Based on previews, I was expecting this expansion to completely change the way that I build my cities by giving me more freedom to pack structures into compact spaces and to more seamlessly integrate parks with business districts, leisure and tourism districts, or neighborhoods. I immediately started thinking of multiple ways that I could potentially use these 2 ideas to create new city layouts and concepts. Unfortunately, I set my expectations too high, and pedestrian areas ended up not being quite as game-changing as I thought and hoped they might. The big problem is that Plazas & Promenades is just another iteration of the paintable area concept that has been the focus of almost every expansion since Parklife. Paintable areas is a good mechanic for things like parks and university campuses, but it can be extremely limiting for an application as broad as neighborhoods or entire districts.

Plazas & Promenades allows the construction of more walkable neighborhoods and districts.

Roads minus the cars

First and foremost is the simple fact that the new pedestrian roads look and act more like regular roads than like pedestrian paths. They are the same size as roads, being either 2 or 4 tiles wide, and are laid out almost exactly the same. None of these pedestrian roads are 1 tile wide. And, of course, the legacy pedestrian paths have not been updated to allow buildings to be zoned along them. The end result is that these "Pedestrian Zones" don't take up any less space, and aren't any more compact than any other district. Though, the high-density, "wall-to-wall" residential buildings do have the same capacity as the normal, high-density residential skyscrapers (20-26 households), despite being a fraction of the size. So I guess it's "more compact" vertically? More people being crammed into smaller spaces? If so, it doesn't seem to have any impact on the citizen's happiness or satisfaction ratings.

Using Pedestrian roads outside of Pedestrian Areas is a liability, since zoned buildings may build on them.

Even though pedestrian roads can be placed anywhere, buildings can only be placed or zoned along them if they are in a dedicated Pedestrian Area. So if I want to create a single walkway or alleyway and zone some homes or shops along it, I have to paint the entire area as a Pedestrian Area. Well, at least, that is the case if you want the buildings to be functional. The game actually will let the player zone and place buildings along pedestrian roads outside of pedestrian areas, but doing so will result in the building flashing a "Not in Pedestrian Zone" warning, and the building won't operate.