The problem I have with your line of thinking is that it basically seems like the main reason you like your SFH neighborhood is that it's right next to one that's not SFH; if you were surrounded by multiple layers of SFH, you'd lose the ability to have the nearby businesses staffed people you're describing as not living in that type of zoning. It's not clear that the non-SFH home neighborhood with all of the businesses near you gets anywhere close to as much benefit from the proximity to your neighborhood (the closest thing to this I can find is that you mention you have well-maintained parks, but it's not clear why you think that this couldn't exist in a large cluster of non-SFH neighborhoods as well; I've lived within a few blocks of very large, well-maintained parks in separate neighborhoods where there were no SFH neighborhoods anywhere close by).
Combined with some kind of odd ways is describing things (cities being "colonized" in recent decades, people moving to LA because it was on The Real World, as if there hasn't been close to a century of tropes of people moving to Hollywood to pursue show business, implication that eliminating SFH zoning requires you to "move out" when it certainly does not require any individual homeowners to do anything different than what they're already doing), it's hard not to get the impression that you're basically trying to argue in favor of NIMBY without actually saying it.
Combined with some kind of odd ways is describing things (cities being "colonized" in recent decades, people moving to LA because it was on The Real World, as if there hasn't been close to a century of tropes of people moving to Hollywood to pursue show business, implication that eliminating SFH zoning requires you to "move out" when it certainly does not require any individual homeowners to do anything different than what they're already doing), it's hard not to get the impression that you're basically trying to argue in favor of NIMBY without actually saying it.