Not really. I merely pointed out that a word that had previously been used as an adjective subsequently became also used as a noun to refer to particular types of new material. Whether that was 'a mistake' is essentially a subjective question.
There is plenty of precedent for words having different meanings in different contexts, or when used in different ways (e.g. as an adjective or a vowel), or for words to require additional meanings with the passage of time. Words like "switch", "cable", "lamp", "plug", "socket", "terminal", "fuse", "conduit" etc. etc. all had meanings long before anyone had heard of electriocity - so it it a 'mistake', or 'incorrect', that we use such words in an electrical context?
One can only correct 'mistakes'/'errors'- and, as above, whether a change ualifies as 'a mistake' is largely a subjective question.
Well, I'm certainly not 'in charge' of anything. I obviously understand all of what you say, but don't necessarily agree with it.
What I also understand is that you appear to exercise what I can but describe as 'intellectual arrogance', by seemingly assuming that there was something magic about the point in time at which you learned ('correct') English. You seem to feel that the language you were then taught back then was 'correct', and any subsequent changes 'incorrect', despite the fact that your parents, and all their predecessors, undoubtedly thought that some of the things you were taught were 'incorrect' (in relation to what was regarded as 'correct' when they had learned the language).