I'm glad Miami is finally joining the "hundred-story" club, but I think Miami really needs to clamp down on developers building towers that span almost the entire north-south distance of the lot. There are ALREADY towers in downtown Miami and Brickell where someone below the 40th floor will literally NEVER have direct sunlight coming into their windows, because 2 or 3 rows of wide, taller buildings to the east or west (depending upon which side they're on) act like venetian blinds and leave them in eternal shadows.
In cities with sane zoning laws, the strategy for maximizing the floor area of your building is to make it taller, more slender, and shape the upper floors so they're as close as you can get to a square rotated 45 degrees (so the points are towards north/east/south/west), which maximizes the amount of direct sunlight that can shine into buildings behind them. It doesn't necessarily happen all day, or every day, but it ensures that everyone gets to have at least a little direct sunlight for part of the year.
In Miami, developers maximize height by building towers with upper floors that are SHALLOW rather than NARROW, thereby ensuring that in the tragedy of the commons, nobody besides the people living in last row of buildings before the bay can actually get real sunlight.
The other problem with downtown Miami is claustrophobia. Miami allows developers to build WAY too close to the street, with NOTHING human-scaled along the sidewalk to soften the blow. Walking through Brickell and downtown Miami doesn't feel like an "urban canyon", it feels like an "urban CAVE". I've been to a lot of big cities, but downtown Miami leaves me with a weird sensation of feeling "crushed" in ways no other downtown -- Manhattan, San Francisco, and Chicago included -- does.
Maybe it's just me, but at street level, downtown Miami and Brickell are literally starting to feel like the sensory overload from a street scene in a dystopian videogame.
The problem in downtown Miami isn't the crowds... it's the relative lack of them, and the efforts by street-facing businesses to make up for it by covering every fucking square inch of vertical wall space within view of a sidewalk with video displays. You can't look at ANYTHING without having your peripheral vision constantly assaulted by blinding animations. Add to that the total lack of public parking, so every building needs its own garage and curb cuts... so you're walking down the sidewalk, constantly getting distracted by video displays that are either animated or change every second or two, AND you have to constantly watch out for cars crossing the sidewalk in front of you every 50-100 feet.
Simply put, downtown Miami is DIFFERENT than it used to be, and in some ways it's BETTER, but to me at least, the experience of being there quickly stops being energizing, and rapidly becomes merely stressful and tedious. Downtown Miami today feels less like South Beach on Friday night, and more like a mall on Black Friday, or an airport terminal.