Most written Hebrew does not include the vowels and Israelis are used to reading consonants and understanding the words within their context. There are, however, two spelling conventions, 'defective' and 'plene'. The 'plene' or full spelling uses two letters as vowels and is very popular in Modern Hebrew. The defective spelling may be ambiguous in some cases. In standard texts, Israeli publishers tend to use vowels only in the case of ambiguity.
Libraries tend to prefer the 'defective' orthography.
Word processors with Hebrew capacity offer the possibility of adding vowels, but the library software does not include this provision. Libraries under Unicode will be in a position to eliminate ambiguity from their Hebrew catalogs. I am not at all sure that we will all be satisfied that we can no longer claim that for technical reasons, we are ignoring diacritics in European languages. The disadvantages of Unicode from the Israeli point of view, would seem to be the need for marginally extra resources to handle the much larger character set and the additional storage required. In the case of Hebrew, the algorithm for alphabetizing will be more complicated than the present algorithm, since punctuation and other special characters are common to the other character sets.