gentrification of the East Side with yuppie condos replacing traditional black and hispanic neighborhoodsIt's these kinds of bogus characterizations that NIMBYs subsist on.
In truth the well-off professionals are gentrifying the single-family neighborhoods by renovating houses, buying tear-downs, and buying new houses on lots where the existing properties have been demolished. This kind of gentrification would have (and still could) gentrify the entire neighborhood without any change in density, and the NIMBYs don't have any problem with it.
The high-rise residential units are displacing some single-family homes but just as often former commercial spaces. There are a lot of luxury units, but there are also a lot of units occupied by young people who are cutting hair, tending bar, and working in low-level jobs at tech companies, people who are light-years from being able to afford the kind of single-family housing the NIMBYs want to preserve. East Austin is affordable for them because they can get by without a car and without car insurance. In a pinch (doctor's appointment across town) they can use Uber and Lyft. This new lifestyle and new look to the city is the change that the NIMBYs are opposing, but because they identify as progressive, they have to flip the economics and pretend the single-family homes are for middle-class people and the high-rises are for those obnoxious rich folks.
Hence the NUMTOT meme of "new housing is unaffordable housing." It's a way to square the circle and sound progressive and claim you want affordable housing and green cities while keeping the supply of housing low and forcing sprawl. Every time somebody tries to build high-density housing, you paint it as a luxury amenity for the rich and say we can't have this, we need affordable housing instead.
As for architecture, it's true that most developers don't give a shit about how their buildings look, but if you look around in the older single-family neighborhoods, and even more so the newer single-family neighborhoods sprawling at the edges, you see exactly the same thing, a load of ugly houses built by developers and a few charming or beautiful ones where by some miracle something nice fell through the cracks. As the high rises go up, we'll get a lot of bad and some good here and there, just like we already have.