I have a similar disdain for security bloatware with questionable value, but one actually effective corporate IT strategy is using one of those tools to operate a whitelist of safe software, with centralized updates
In Windows land it's pretty much expected that you go to random websites, download random executables, ignore the "make changes to your computer?" warnings and pretty much give the exe full permission to do anything. It's very much been the standard software install workflow for decades now on Windows.
In the Linux/BSD world, while you can do the above, people generally don't. Generally, they stick to trusted software sources with centralized updates, like your second point. In this case I don't think it's a matter of capability, both Windows and Unix-land is capable of what you're suggesting.
I think phishing is generally much less effective in Max/Linux/BSD world because of this.
And no one would pipe a script downloaded with wget/curl directly into bash.
And nobody would copy a script from a code-formatted block on a page, paste it directly into their terminal and then run it.
Im not going to go so far as to claim that these behaviors are as common as installing software on Windows, but they are still definitely common, and all could lead to the same kinds of bad things happening.
I think though that the culture of robust repositories and package managers is MUCH more prominent on Mac/iOS/Linux/FreeBSD. It's coming to Windows too with the new(er) Windows store stuff, so hopefully people don't become too resistant to that.