It's a sort of silly trivial example... but I've watched multiple python codebases slowly become unmaintainable because Python has no way to enforce what can be called or overridden by instances or subclasses, and the org grew beyond its ability to enforce discipline about it in code review.
I feel like Forth would offer orders of magnitude more "temptations" for somebody who just needs to get something done, but I've never seen it done at scale.
At the other extreme you have Swift which is not Good (as opposed to no good) until V5 which is now obsoleted by V6. Do we all know how screwed Apple is when it comes to LLM training coverage of Swift 5 or 6? Short of their own codebase (and even then), where are they going to get enough training data to help all the Vibe Coders and novices? Could take years to resolve this.
Weird future, eh? So FORTH may not be "fashionable" but it is hella fun and very good in a number of dimensions. With the right LLM interfaces (which love large libraries of concise word-like primitives), world domination is assured.
Writing a new Forth may be an interesting project, but you will not write a good one until you have a few applications under your belt. Forth is a very subtle language. The internet is full of abandoned Forth kernel projects. Many of these may well have succeeded if they had a purpose that was not yet satisfied.
It is perfectly possible to write large applications in Forth. One of our clients has an application of 1.4 million lines of Forth source code. It is hosted on VFX Forth, which compiles Forth to native code. The VFX version runs at least ten times faster than the previous threaded code version, built on MPE's ProForth compiler.