Being able to read x64 assembler even if you can't write it is great for debugging strange issues.
Back in the day I wrote [1] about simple Java string concatenation. I still get people quoting it now, even though I'm sure it is completely outdated by newer compilers.
It gets even more interesting when you see what x64 (or whatever!) assembly is generated by the JVM.
[1] http://nicklothian.com/blog/2005/06/09/on-java-string-concat...
- it will not be understood, you might get downvoted
- it will be understood and you'll definitely get downvoted