Simple answer: Musicality and phrasing.
Obviously a lot of music has a triplet feel. So many ways to write it... 4/4 with triplets, 3/4, 3/8, 6/8, 12/8, etc. Each musical phrase tends to have a build of tension→ then release of tension/resolution of the phrase. Phrases build upon each other creating (metaphorically) paragraphs or entire musical statements (often missing in popular music).
While your brain is "wired" to 4/4 there are other duple time signatures that a common: 2/4, 4/8 as examples. And then there are other time signatures that can REALLY challenge some. Example: Allman Brothers Whipping post. You can call it 11/8 if you want or you think 3 measures of 3/8+ 1 measure 2/8.
...And then there's Dream Theater...
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Assuming is not knowing. Knowing is NOT the same as understanding. There is a difference between compassion and wisdom, however compassion cannot supplant wisdom, and wisdom can not occur without understanding. facts don't care about your feelings and FEELINGS ALONE MAKE FOR TERRIBLE, often irreversible DECISIONS 
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