Probably no, not in this specific form, that being said I don't want to compare one tragedy to another. There are lots of disgusting parts of the human history, and that's certainly one of them.
Frankly that's something I do not understand. Why this single specific word? We have dozens of terrible offensive words. Why this specific one is considered so bad we cannot even talk about it directly, even when merely discussing it? I would think discussing it and not directing it at someone would be pretty reasonable. As with every single other word.
Yes, the Galaxy S5 was the only Samsung flagship using the micro USB 3.0 port. They backpedaled to micro USB 2.0 in S6 and S7, and then migrated to USB-C in S8. I'm not sure about the Note series.
Unlikely, the A plugs are for the host devices while the B plugs are for peripherals. It got blurred with smartphones (see: USB-OTG) but in general the host devices were big enough to have full-sized USB ports, so the smaller USB-Bs are extremely rare.
The micro USB most of us know already is a USB-B. Each cable before USB-C had USB-A on one side and USB-B on the other. The square-like one used for printers is a full-sized USB-B, as opposed to the one used in phones (micro USB-B).
My point was that apart from the Macs, there is no single system keychain Signal could use. What they do is perfectly normal and expected on a desktop OS.
Either multiple different keychains or even you can have no keychain-like application in your system at all.
The WiFi passwords are usually stored in /etc/NetworkManager as plain files. Granted, they are not accessible directly by non-root users as they are being managed by the NetworkManager daemon, but there is nothing generic for such a thing. Signal rolling a similar daemon for itself would be an overkill. The big desktop environments (GNOME, KDE...) usually have their own keychain-like programs that the programs provided by these environments use, but that only solves this problem for the users of these specific environments.
To me it's perfectly expected the Signal encryption keys are readable by my user account.
There is no single keychain on Linux, and supposedly on Windows too. Signal would need to either support a few dozens of password managers or require a specific one, both options terrible in their own way. This isn't something that can be done without making broad assumptions about the user's system.
Probably no, not in this specific form, that being said I don't want to compare one tragedy to another. There are lots of disgusting parts of the human history, and that's certainly one of them.