[pjmlp]

Except they have, just not to the same extent as some other languages.

K&R C won't compile in modern compilers, not is allowed as per ISO C2X upcoming standard.

gets was removed.

And if you are using optional Annexes, they might not even exist in ISO C compliant compilers.

Similarly, that Java code will die if it uses internals made private in Java 9, inherits from JDBC and has methods with names that were later added to more recent versions, uses deprecated methods that were finally removed around Java 10 time,...