I'm getting the impression that this is only "obvious" from a latin-cyrillic-greek alphabet point of view ? P.S.: Also, even for those, it would seem that one

I'm getting the impression that this is only "obvious" from a latin-cyrillic-greek alphabet point of view ? P.S.: Also, even for those, it would seem that one of the big reasons for things like combining characters was added to Unicode in order to be backwards compatible even with mutually incompatible encodings ?