Young people complain how much more expensive homes are now, and then can't be bothered to accept a starter home..
"I just can't understand why I can't afford this 3,600 sq foot home near downtown Austin at age 25, life is unfair!".
Things like Minimum Lot size, out right restriction on size of home, and other "building codes" that have nothing to do with the safety or long term viability of a construction project
It is unlikely the development my grandparents home is in would get zoning approval should a developer seek to build a similar neighborhood today. The lots sizes would be too small, the homes would be too small, and various other things would be non-compliant with modern building codes which does not mean it would be unsafe.
The rest of your sentence doesn’t change this bit.
Tons of young people today won't even move to the valley or to another state.
I worked in car sales and basically every dealership mechanic over 28 owns a home. But tech people complain about how they can't buy one somehow.
Often it could be "afforded" by the HN-income crowd just by not buying a new car.
Similar to years past, except people are less willing to do that now.