[c0decracker]

Great point IMHO. I think the ability to learn these somewhat different languages depend on the experience. Like roots of different trees -- once you groked Asm/C, C++, Python and such, Lisp and such enough, you can get productive in most general purpose languages quickly enough that language learning time will be negligible compared to platform/ecosystem/domain time at least for any reasonably complex domain.

I think more pragmatic question in such situations however, is why the potential employer is requiring $A years of experience in $TECHNOLOGY. For example, why they need someone to be productive from the say day $N and what does it actually mean (for them) to be productive?..

IMHO getting to shared understanding of what drives such requirements can help find a better path forward for both sides.