Keychain Access has been there since the beginning of OSX/macOS. It's quietly been storing email and wifi passwords this entire time. Many, before there was an alternative like 1Password, used the app to store other info within as well through secure notes. Passwords in iOS and Safari, along with Keychain sync in iCloud have expanded the keychain functionality over the years and it's been fine for ~25 years or so. I have faith they won't suddenly screw this up and comparisons to less critical stuff like Screen Time aren't really valid here. And sherlocking? I don't think so. When 1Password came out, it was clearly inspired by Keychain Access that had been there for years prior with similar functionality and even user interfaces.
Keychain Access has not been "fine". It's had multiple unaddressed data loss bugs. For example, Keychain lost all passwords from all Keychains after the Catalina update[1] and this wasn't fixed in the next 3 Catalina minor updates. Multiple users reported the issue to Apple and the response was crickets. Even if you restored the passwords, it helpfully deleted them all again. I switched to 1Password and declared Keychain Access a lost cause. I don't think I'll be giving them a second chance here.
Depends on how we define "fine," but your own post clarifies that it was "website passwords -- but not app passwords, secure notes, certs, or keys." That's a pretty big difference compared to "all passwords" and seems like it affected a small number of people. In any case, if we're using anecdotes, I haven't had any issues with it so far and it's been decades. Given how 1Password has been getting shittier over time, I've been looking for an alternative, and I for one am going to give this a shot. You can check in with me in a few more decades and ask me if it went okay.
I went to a lot of trouble to install an ERV — a Panasonic model. Brought my CO2 levels down from consistently over 1200ppm to ~500ppm with people in the house. Hot/humid areas make it difficult to bring in fresh air since the moisture in the air can lead to all sorts of issues and obviously it's very inefficient to have 100 degree air coming into the house when you're seeking mid-70s temps indoors. ERVs are designed to address these issues.
Check out a video here to see how these things work (this demo is an HRV, so it doesn't help with humidity, but you can see how well it works when there is a big temperature difference between indoors and outdoors).
