However, the data says otherwise.
1. Since 2015, Homeownership Rate in the United States (https://fred.stlouisfed.org/series/RHORUSQ156N) has fluctuated around the average of what it has been since 1965.
2. Since 2015, Monthly Supply of New Houses in the United States (https://fred.stlouisfed.org/series/MSACSR) is at or above the average of what it has been since 1965 (modulo pandemic years).
3. Even to account for the selection bias of techies on this site from expensive regions, homeownership rate in California has been pretty flat since 1960's (https://www.ppic.org/blog/homeownership-trends-in-california/)
So is it just a phenomenon that those who cannot buy are more prone to complain and those who can don't bother to participate in such discussions?
https://www.statista.com/statistics/208072/share-of-first-ti...
People who are already positioned in real estate aren't as affected by rapid price increases when they're looking to sell one home and buy another because the home they're selling was along for the ride. They're impacted, but much less so than first-time homebuyers who are either short on assets altogether (most working individuals/families trying to take the next step on the default treadmill) or have assets that haven't been performing as well as real estate.
Those first-time buyers need to directly relate the purchase price of the home to their savings and income and it gotten very hard for them to that. The worse it gets and the longer it sustains, the more it looks like a failure to attend an entire generation of workers and their families.
Your graphs do not address affordability. Find data that shows housing costs compared to percentage of average income for a given area. Subtract rental costs from the average income to determine loan affordability or even qualification, since loans see rental costs as an expense for calculating available income towards a mortgage.
This data is highly variable depending on location. California as a whole may be fine -- how about it's most populous counties or cities? How much does the rural divide skew the numbers, if any?
Why are the rates you've presented flat since the 1960s?
So no, it's not just a bunch of people complaining for the sake of complaining.