1. why haven't I heard anything during all the appointments? It must be possible that the noise also fades into the background for me
I can well imagine that. During appointments, you have appointments, meaning you have something to do/talk to people, or your mind is elsewhere. And the brain can excellently filter out noises if it wants to. However, you can unfortunately only control this to a limited extent. I worked at McDonald's when I was young, and anyone who has ever wondered why the employees let the fryers beep for hours: Because they don't hear it anymore. No joke. The brain filters out this horrendously loud beeping very efficiently when you have something else to do. So much so that you no longer perceive it. Nevertheless, my neighbor’s constant country music droning in the garden continuously drove me crazy, even though it wasn’t nearly as loud. You can’t choose what gets filtered out.
The quiet retiree neighborhood also reminds me of us back then. I loved that too. But: My oldest child is now 5, and there’s quiet in the garden at the earliest when everyone without a driver’s license is in bed. Around here in the neighborhood there are kids and a playground. You always hear something, and that simply belongs in a new housing development.
In the first house, I also fixated a bit on the noise. In my defense, it was also simply louder there more often than average. But even here at the new place, a neighbor sometimes has a radio playing when he’s working in the garden. But it feels much, much rarer like that. And it bothers me much less here. Back then the noise situation basically spoiled the whole house for me. Today I sometimes ask myself whether that was just a psychological outlet, and I was actually just generally unhappy there, and couldn’t really admit it to myself because in principle "everything was perfect" in the new building. So the psyche grabbed the one straw that was obviously not perfect and multiplied the problem by a hundred somehow.