I’m curious too. Koreans, for example, think in an alphabet similar to ours (actually fewer letters), but it forms into a grapheme. I don’t think that is the case here, but don’t know for sure.
Not Korean, but the Korean case is different, a bit. Korean syllable blocks are viewed as syllable blocks -- a new concept, whereas Indic consonant clusters are simultaneously viewed as letters of their own and fundamentally composed of more letters.
