It is indeed annoying.
I have made the upgrade from an older version, and I was thinking there must be some tweak I had overlooked. I was looking everywhere, but could not find anything to change this. Reading the forum I learned I was searching for something that does not exist! It is disturbing you cannot change this behavior. Especially when you have a lot of tracks it is sometimes difficult to align (or offset) parts without guide lines.
I also seen no sensible reason to change this behavior from older Cubase versions to this. I also do not see a reason why it could not brought back as an option.
I really like the newer version of Cubase, but some design choices are, well, …a bit weird…