Whether you need masking or such level of tools is dependent on how you approach photography. You can change your method of taking photos to remove such a need for editing.
I mean yes. But the advent of exposure / focus bracketing lifted the dynamic range limit for most cameras. The only other way, at least for landscape I see is to buy expensive ND filter plates or invest into a camera with more dynamic range.
Give us a tutorial please. Otherwise this statement makes no sense.
There's a kernel of truth here. But it's not true in the general case.
Others have responded about dynamic range and HDR, and that's one area where a particular feature set is necessary for certain kinds of photography.
Astrophotography and macrophotography both very nearly require focus-stacking abilities.
There's certainly a lot of photography you can do with just a camera, or with just a camera and very basic editing tools.
But having advanced tools opens up a whole world of possibilities. Those aren't all going to be things that everyone wants or needs to do. But there's a huge number of artists who will want or need some of them.