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by muglug 2498 days ago
By providing PHP-backwards compatibility HHVM, Facebook provided an off-ramp for themselves and other existing PHP users at a time when HHVM was much faster than the PHP interpreter.

But then PHP sped up, and once it became clear that people had stopped using that off-ramp, Facebook demolished it. The off-ramp was infeasible to maintain, and of no benefit to anyone.