Because pip is very powerful tool, which for example create all needed dependencies while installing some package. Without it, it's very likely that installed package can be working with some problems (exceptions, bugs, broken launches and etc).

Don't be angry on me, but for me it's look like i tell you: "here is hammer, you can use it to hammer in nails" And you asnwer: "No, thanks, i will better use my head!" 



Not using smartphones? Because it's well known fact that many programs on it (like instagram) can record any information through smartphone's receiver. Without you even notice. I have interesting story by myself 

Or not using Intel component parts, because it's well known that they implement backdoors in their hardware.


Everything in the world have bad point, normal point and overkill. Your way - it's obvious overkill, on my modest view.