Sure, and I've seen some good projects, and less than good projects.

In my city, they took a street and closed it and redid it as pedestrians only. Worked great, more foot traffic going from any establishment to any other, and car people only had to walk an extra block or two to get to things.

There's a section where they made a highly walkable environment from scratch, with car access basically through entering a big mostly underground parking deck, so the surface was reasonably car free.

On the flip side, the city loved these efforts so much they mandated mixed use zoning for all new construction. And the three big projects I've seen play out under this new scheme all followed the same recipe:

• Proposal with 90% residential, and 10% "retail/commercial"
• The proposal is phased, with hyper detailed residential plans and a vague box for the "retail/commercial" phase "to come later"
• The residential is built, and then the company withdraws their plan for further development.

One that did go in for the true mixed use early on suffered because no commercial tenant would tolerate streetside only parking (which was effectively part of the deal, given how the regulations were written parking lots/decks were not viable for these "walkable neighborhoods" when they could just have a parking lot or deck nearby by setting up their business somewhere else)