he/him 
JSX vs templatespic.twitter.com/rkoqvuYF9s
I don't think it prevents any sort of optimizations. Just vastly increases the technical complexity and effort to build them.
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The technical complexity imposes unacceptable trade-offs. Example: JITs can get fast, but impose cliffs and memory usage bloat.
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At least someone is talking about the Memory trade offs ;p
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