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The low number of ASCII symbols forces developers to reuse them for all purposes. The number of security holes with ASCII characters is order(s?) of magnitude larger than with Unicode. The problem of apple vs appIe (all Latin) vs аррІе(all Cyrillic) vs elppa (all Latin in reverse) is well known.

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In practice, re-use is a relatively limited problem.

At 128 vs. 10^20 possible codepoints, many in Unicode with side effects, the problem of deceptive or unintended use is exceedingly high in Unicode.

With far too many special cases to hold in human working memory, or even reasonably within most code-bases.

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