I don't doubt that languages evolve.
What I want to describe is that it's not like the whole nation gathers together once a year to decide on changes to the language.
You seem to want to describe it in a way that can be used exactly the same and still describe biological evolution:
Biological evolution is driven by selection pressures of the environment on random unconscious changes in the variation present in genes in a species.
Language evolution happens through the gradual accumulation of random unconscious changes in the variation present in the vocabulary, syntax, and grammar of a language as selection pressures act on those raw changes.
Sure, they are very similiar but why do you want to describe them in the
exact same way? What's the point?
And don't you think that sorta hides the differences that do exist?
What sayeth ye? Are the changes that emerge in language random? I say yes in that they are unforseen (maybe not completely).
They can be unconscous, but I don't think we should eliminate that they can also be conscious.