vim-textobj-entire VS argtextobj.vim

I agree that ggVG is fine but not with the custom leader to copy to clipboard part. If you're gonna have to remember something might as well use a text object instead, that way you get the full range of actions and not just the hardcoded mapping. I use kana/vim-textobj-entire that provides e for entire buffer, so copying would be yie and life is smooth. There's a bunch of text object plugins, just get one or write it yourself would be my advice.

I like the entire document text object: https://github.com/kana/vim-textobj-entire

You should make your life easier and get the entire text object plugin. This is the easiest way to act one the entire buffer with no surprises, although it still does change the cusror position sometimes, but I still recommend it.

kana/vim-textobj-entire - Make entire buffer available as a text object

I now use entire text object for this with vie, which is more mentally coherent, for me, than ggVG.

kana/vim-textobj-entire adds e as text object for entire buffer

die (delete in entire) with the plugin vim-textobj-entire

I would suggest adding the text object "entire", either by making your own omap, or using a plugin like vim-textobj-entire.

Vim plugins (without UI) work out of the box. Hello vim-surround, argtextobj.vim and whatnot.

As /u/Schnarfman suggested, you can use a custom text object - something like argtextobj.vim, which adds the a argument text object, so from (cursor is I)