I'd also like to see XeLaTeX become the default, but unfortunately there are still a lot of old documents and journal templates that are not compatible. In the

I'd also like to see XeLaTeX become the default, but unfortunately there are still a lot of old documents and journal templates that are not compatible. In the mean time, we try to auto-detect which engine to use, so if you load the fontspec package, for example, we'll automatically use XeLaTeX.