Sure, but one might imagine that linkers are generic and reusable, so you can just pick one off the shelf instead of making a new one 1-1 for each language. Empirically this line of reasoning seems to be incorrect.
Different programming languages are very obviously not the same thing - different cp command implementations are similar conceptually to having different linker implementations that all do the same thing. But you knew that so not sure if there was a point you were trying to make there.
> Different programming languages are very obviously not the same thing
It isn't obvious to me at all. The difference between Java, C# and Go is about as important as the difference between Makita and Bosch for power tools. Yes, some people swear by one or the other, but by the end of the day it really doesn't matter