In theory cross-compilation should be just as good as native, and helping to turn that into practice by creating heavy users would actually be lovely. Sadly this has become a lot harder (before it becomes easier one would hope) on Ubuntu 12.04 with their new multi-architecture system - at least many X11 development packages currently won't install for several architectures in parallel. At least in this case the fixes are not too hard, so I haven't yet given up hope for a fix before the actual release!
Back to Fedora though - if x86_64 is better at compiling and ARM at saving power, it seems to me that being able to build on x86_64 is a good example of what a cross-platform system is good for.
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