I have been able to do powerful things in TCL, and quickly. However, I believe it is one of the most difficult languages to debug, and its maintainability cost

I have been able to do powerful things in TCL, and quickly. However, I believe it is one of the most difficult languages to debug, and its maintainability cost is extremely high. You can't underestimate the risk that this is to a project. Part of the problem is that the language doesn't defend well against bugs. Consider what happens if you pass your index and list arguments in the wrong order to "lindex"...it silently takes the index from your list, and then includes your intended index as part of the list! This is the kind of mistake that can silently appear to work, or fail in subtle ways, and it's not worth the debugging time in my opinion.