Well, I was almost done with a pretty long-winded response that got lost to the auto-logout, but in short, I'd like to address these two snips...
I can't take a position on whether multi-family housing is a desirable policy goal for our community--I am not privy to all the considerations that are going into those discussions. It touches everything--schools, congestion, road maintenance, utilities, taxes, crime, housing affordability, diversity, emergency services, mix of rentals vs owner-occupied...
Again, though, it's gonna be a local thing, and it's unwise to try to impose a single approach everywhere.
By acknowledging that you are not an expert on these things, you are wiser than the vast majority of people who are advocating for NIMBY policies. They are also not experts. NIMBYism is not a carefully considered technocratic set of solutions to the multi-variate cross-disciplinary dilemmas of municipal finance, housing economics, transportation systems, racial equity, urban planning, etc... it's a simplistic "I moved to my neighborhood because I like the way it is, and I don't want it to change." But if every neighborhood is frozen in amber, there's no room, on a regional or nationwide scale, to adapt to the needs of future generations. The
actual experts in all these fields basically all agree that a gentle increase in density throughout all cities, towns, and neighborhoods is an effective policy agenda to pursue.
Local politics are overwhelmingly driven by older folks who know they'll be sticking around for a long time, and who have time on their hands to attend lengthy boring meetings and give public comments (eg. retirees). Overwhelmingly putting power over land-use regulation in the hands of older, settled people means the needs of younger people and people who move a lot are completely ignored. Speaking from personal experience, someone in their early 20s who moves every year might just call their parent's address their "permanent residence" for simplicity sake, and be voting in statewide elections, but have minimal voice in terms of the place where they actually live, the place they're moving next year, or even the place where they're voting (because they can't actually show up at a meeting and harangue the city council in person). And that's assuming that a young person is even voting. But whether a young person is voting or not, they do need a place to live.
In effect, by giving local government too much control, we are currently enacting a single approach everywhere: NIMBYism. We're stuck in a bit of a prisoner's dilemma where people understand that something has to give in order to address the housing crisis, but no individual municipality is going to be the one to flip the switch on allowing new development without a promise that neighboring communities will pull their weight too.
Top-down, state-wide solutions like we're starting to see in
California (and to a lesser extent,
Oregon) seem like the only way out of NIMBY stasis. If the state gives local governments a minimal obligation to meet statewide housing goals, then local politicians and bureaucrats can actually focus on the best way to locally implement these solutions, rather than being barred from discussing solutions altogether for fear of NIMBY retribution (eg. not getting re-elected). And people will feel more enfranchised as active participants in a positive change for their region and their state if they know that every community is contributing.
Some ADUs and plexes here and there will not "destroy the character" of any suburban neighborhood. Many of them will be completely unnoticeable. Elderly folks moving into granny flats are not going to cause a traffic crisis or a spike in crime. A duplex doesn't put any more burden on municipal services than two couples living as roommates in a SFH or an adult child living with their parents. These changes in population density are
already happening due to the housing shortage, just without the changes in housing forms that enable people to live in their own independent spaces with privacy and dignity. (And on the plus side, an ADU
adds to the property value of a single family home, so these forms of gentle density will actually increase property tax revenues for municipalities, enabling better schools, better emergency services, better transportation infrastructure, etc..)
California reached crisis levels in their housing market far before any other state, and they're now reaching solutions far before any other state. These solutions will take time to come into effect. New legislation can't generate new buildings overnight. But at least now they can begin to chip away at the problem. If other states are wise, they'll learn from California's mistakes sooner rather than later. The experts agree on the solutions, but local elected officials can't enact those solutions without getting voted out of office. It's only at the state level that housing solutions can be enacted in a way where all municipalities know that they're sharing the responsibility of gradual, gentle densification.