I read that as "let me mix them together like a PHP spaghetti app". The original poster may not have meant that, but after 13 years of writing PHP, the common complaint I still hear from newbies is "but structuring my code/using a framework has such a steep learning curve!". I'd rather like separation of concern enforced at the language level :)
And no, I don't have a clue how that'd work ;)
...now, I first learned coding by solving algorithmic math problems in C, but if someone would've tried to make me learn C++ or Java and OOP at that point I would've had the same complaint your newbies are having about "why learn so much just to 'structure' my code?!" :)
Unfortunately it also makes possible the abuse you note - hopefully there's better solutions than requiring a different language in those 3 places.