The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
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Web fonts change the equation. Sites that serve custom web fonts via @font-face may inadvertently reduce or increase confusable risk depending on the font’s glyph design. A display font with distinctive Cyrillic letterforms would lower the danger rate. A geometric sans-serif that harmonises Latin and Cyrillic would raise it. Neither outcome is typically considered when choosing a web font.