I think restraint and common sense are key here (once you're comfortable typing the non-ASCII characters). In parts of my code it's much more intuitive to use \

I think restraint and common sense are key here (once you're comfortable typing the non-ASCII characters). In parts of my code it's much more intuitive to use \Omega or \Sigma and \mu than giving them ASCII names, and others looking at my code will immediately understand what the matrices and vectors do. On the other hand, if you're going to use \mathfrak{i} to index a simple loop you're doing it wrong.