Marx indeed was responding to a historical point in time: class society. You are confusing socialism with the abolition of class, and therefore arguing against the dictatorship of the proletariat and for a "state of all classes," a class collaborationist take that goes directly against Marx.
The dictatorship of the proletariat is indeed temporary, it lasts precisely as long as class society exists, and class society exists as long as there is production and distribution that is not yet collectivized globally, and still longer than that. It is not a "permanent repression of the people," but a temporary repression of capitalists and reactionaries. Again, you reveal your class collaborationist reading of socialism by pretending it's the people repressed by socialism, and not the capitalist class.
The removal of "civil liberties" applies specifically to the capitalist class and those that oppose the working classes. Just like those civil liberties are de facto removed from the working class in the dictatorship of the bourgeoisie, so too are they removed from the bourgeoisie in the dictatorship of the proletariat. No society is permanent or static, this is a fundamental law of dialectical and historical materialism.
I'm honestly confused by how someone could take away such a class collaborationist reading of Marx and shudder at opposition to the bourgeoisie having any political power. If you think oppressing the bourgeoisie is terrifying, and democratizing society for the people is terrifying, I'm confused at how you could consider yourself a socialist at all.