I disagree. The old crow is more of a brutalistic design with more horizontal lines. The Deco style has more vertical lines which blends in nicely with the gothic style.
Besides the current ruin spures already borrow from a whole range of different architectureal styles besides gothic.
Pure gothic style makes nice cathedrals but to capture the technocratic bureaucracy that I imagine in an Imperial city I'd like to see more of a combination of styles; Large anonymous facades of endless offices that seem to reject human nature. A gothic cathedral is actually quite interesting to look at with many beautiful variations. Problem is that a lot of the gothic elements (buttresses etc.) make it a bit tricky to build something tall. The short tall sections from the ruin spures try this to some success though. What I would like to see is sections made in a combination of styles that allow you to build things as tall as you want (ie. some sort of vertical repeatable principle). The Gothic buildings you see on both 40k ad Epic gaming tables simply aren't big enough to my taste

Borrowing a few elements from Art Deco could help solve that problem. The Styrene buildings from Adeptus Titanicus and the printed buildings from the Space Marine 1 and 2 boxed sets did that. I think it helps bring a bit of variation to the table instead of cities full of cathedrals.