Definitely try it, using NixOS after the "horrors" of Arch feels much more secure. Your system is basically unbreakable, not unintentionally, at least.
Definitely try "Read You"! It utilises Material You, has a sick UI and the dev is really nice. I think there are a lot of features, but I've just left almost everything on default.
There's a FOSS companion app for AirPods on Android and some features are "locked" until you press "Activate" and choose "I've spent all of my money on AirPods" as a payment method.
That may be true, I used to be an iPhone Xs user before my Pixel 7, and it used to drive me crazy seeing blue WiFi icon turning white, as opposed to turning the module off completely in the settings, when the icon becomes transparent.
It is nitpicking though, for sure. I have tons of other, more significant complaints about iOS, I was just clarifying what it may have been that the other person was complaining about.
Edit: Moreover, until you deliberately tell your phone to NOT automatically turn on WiFi after an hour or two, it will decide for itself that the time has come and it can drain your battery now.
What he's talking about is probably that turning off WiFi via quick settings or whatever it's called doesn't actually turn off WiFi, you still have to proceed all the way to the settings app.
You are absolutely correct, you got both of them right!