:I will answer in my own talk page, as I can see that you do the same. First, sorry about unreverting your edits in Spanish orthography, I don't like reverting regular editors, but sometimes I feel it's the best thing to do. 
 :About the phonemic nature of the Spanish orthography, just ask yourself, if a phonemic writing (whichever one you liked) were imposed on English, your native language, do you think it would fit equally well formal and informal varieties of the language? And why should it be different for Spanish? For example, the Spanish expression todo el día is uttered in most or all informal varieties in Spain as roughly ['tol.'ði.a]. Tell me if you find that phonemic.