That's your opinion. Not mine. I'm fine with developers building next to me. My partner and I live in older MFH housing and we love it. We're glad for the option.
> I see apartments and townhomes everywhere too.
I presume you're a programmer. "seeing" is not believing. Look at your zoning map. The zoning map has the truth. My zoning map has an order of magnitude more SFH zoning than MFH zoning. The only way to hit parity between MFH residents and SFH residents, which isn't even a goal but is a hypothetical, would be to build Manhattan-style skyscrapers, which nobody in this neighborhood wants. Most of the US is the same. I haven't looked at Austin's zoning map but I presume it's the same.