setglobal, setlocal, set confusion

I found out about 'setglobal' and read the documentation. It seems I am
still confused and think that 'set' is more global than 'setglobal'
despite the name suggests.

I tried to set my spelllang with setglobal

setglobal spelllang=en,de

But I found that the spelling in my buffer did not checked for german
spelling problems.

:verbose set spellang
spellang=en

But

:verbose setglobal spellang
spelllang=en,de
Last set from ~/.vim/plugin/settings.vim line 34

So, I have to use 'set' instead of 'setglobal' to set spelllang
globally? What is a reasonable use case to use 'setglobal'?

Kai

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