Engels did comment on Marx's writing style, acknowledging its complexity and depth. He recognized that Marx's works could be challenging to read due to their intricate nature and the depth of analysis. In his preface to Marx's "The Civil War in France," Engels mentioned that Marx's style could be seen as difficult to grasp but emphasized its necessity for conveying complex ideas.
Engels himself was known for being more accessible in his writing style compared to Marx. He often tried to elucidate Marx's theories in a more straightforward manner, making them more understandable to a broader audience. Despite any challenges in readability, both Engels and Marx aimed to present profound socio-political and economic theories that were revolutionary in their depth and scope.