>The current LLMs are making it quite easy to seperate software design from implementation.

I don't really agree. This kind of division of labor has always been possible, with architects doing the design and engineers/programmers doing the implementation. Architects who design systems with lofty requirements with no regard for the cost of their decisions are kind of a meme in the industry. I don't believe it's really possible to separate design from implementation, unless the person specifying the design is really knowledgeable about the problem space.