Why does c++ standard still not include file system and networking? Do you have any clue, why the C++ standard committee is not even thinking about adding such an essential features in the future?
No, mainly because that is not true!
There are ongoing efforts to define standard support for both.
Personally, I don’t see why we need any of this in the language itself. One of the main problems with this is you almost inevitably constrain the language to supporting those mainstream desktop computers that are all you’re considering (IPv4, FAT32/NTFS?) whereas the entire purpose of C++ is to be an abstraction away from practical realities. This is why C++ is so versatile: you can do so many things with an implementation when you are not unduly constrained by a standard.
As for threading it’s already there, and as for GUIs … well, that is rather controversial. You have to define what you mean by that and then you have to define it better than the third party libraries of today and of tomorrow. It’s not trivial.
Feel free to contribute to the standardisation efforts rather than simply complaining.
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solved Why does c++ standard still not include file system and networking? [closed]