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If I understand correctly, UTF-32 can handle every character in the universe. So can UTF-16, through the use of surrogate pairs. So is there any good reason to use UTF-32 instead of UTF-16?
In UTF-32 a unicode character would always be represented by 4 bytes so parsing code would be easier to write than that of a UTF-16 string because in UTF-16 a character is represented by varying number of bytes. On the downside a UTF-32 chatacter would always require 4 bytes which can be wasteful if you are working mostly with say english characters. So its a design choice depending upon your requirements whether to use UTF-16 or UTF-32.