I really don't understand the war behind this I always pressing tab button when I want to tabs(giving more than one space) things Does the war is about pressin

I really don't understand the war behind this I always pressing tab button when I want to tabs(giving more than one space) things Does the war is about pressing tab button vs space button? Or is it about the underlying of it? Afaik when We press the tab button the editor is sending a space right? Then what's with the fuss?