No idea why you were downvoted, there are big limitations about this game: the zoning made of squares favors grids, lack of bike infrastructure, no progress has been made on this, so yes cars and grids unless you want dead areas.
Because the game they're asking for isn't a city builder, it's a city fixer. It's like the difference between playing the FIFA series and the Football Manager series.
Your comment ignores the primary point of their comment, they want to start with an existing city and fix it.
