I get that sorta, kinda, sorta-kinda (this one I quite like though) oughta and sposta imitate speech but it still niggles me to find them "in print", especially when the overall tone is formal.
Occasionally, I have read detailed answers on EL&U in otherwise impeccable, faultless English, containing any one or more of these ‘dialectal’ expressions. I have asked myself what was the aim of the writer, when the rest of the answer is formal and technical in style.
Outside of EL&U are there examples of formal and scholarly texts which contain any of the above expressions? And, ironically, are these forms considered ungrammatical/non-standard when used in informal writing but perfectly acceptable in formal writing when written by an academician?
Google Ngram shows that kinda has been enjoying a massive rise in popularity since 1982, while the other colloquialisms have remained steady.