[Treblemaker]

100's of Klines of code in continuous development over the last 10 years, still currently maintained and continually adapted for new use cases in Electronic Design Automation (EDA) for logical and physical chip design and verification.

Of course it's possible to create "write-only" code in tcl. But tcl is hardly unique in that respect. Good code design and coding practices help to avoid most issues just as in many other languages.

"Everything is a string" (EIAS) is not what leads to a complete mess; it's failing to go beyond an initial, superficial understanding of the syntax and language capability and general lack of discipline that lead to un-fixable messes.