The trouble with Orebfuscator and similar plugins is that while they're incredibly effective, they're very, very expensive to run. They consume a lot of CPU cycles doing deep packet inspection and manipulation, and they consume a lot of RAM trying to cache the results in memory. Small servers simply can't afford it, and larger servers have to cut back on their max players or other plugins. Any server which doesn't have enough CPU or memory may suffer heavy lag and crashes.
In contrast, Anti-XRay is extremely cheap. It doesn't do any heavy processing, and consumes very little memory. It's true that technically cheaters can still use xray to find ores and dungeon chests (Mojang hasn't really made those worth hiding), but they're limited in how much advantage they get out of it. Basically, you're allowing players to cheat (but only very little!) to save immensely on CPU cycles and RAM.
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